diff --git a/.gitignore b/.gitignore
index 0109cf6..13600ff 100644
--- a/.gitignore
+++ b/.gitignore
@@ -33,6 +33,8 @@ frontend/android/app/release/
 release/
 backups/
 filing/
+.backup-before-update-*/
+.deploy/
 *.apk
 *.sql
 *.pem
@@ -48,6 +50,11 @@ frontend/android/app/libs/push/*.aar
 # Local tool metadata
 .agents/
 .codex/
+.codex-build/
+.codex-*-a/
+.codex-*-b/
+.codex-*.patch
+backend/.codex-tools/
 .git-local/
 .idea/
 .vscode/
@@ -55,3 +62,6 @@ frontend/android/app/libs/push/*.aar
 *.log
 *.tmp
 *.swp
+
+# Generated Admin Web static assets
+backend/MiaoJiZhang.Api/wwwroot/assets/*
diff --git a/docs/DESIGN.md b/docs/DESIGN.md
index e5a0ac5..8c7bad9 100644
--- a/docs/DESIGN.md
+++ b/docs/DESIGN.md
@@ -1,6 +1,8 @@
 # 喵记账 · AI 记账 APP 设计文档
 
-> 状态：UI/UX 设计阶段 · 更新于 2026-07-18
+> 状态：设计规范已落地，持续跟随实现迭代 · 更新于 2026-08-21
+
+实现进度、已完成模块和当前风险见 [`STATUS.md`](STATUS.md)。本文保留产品决策、视觉规范和后台边界。
 
 ## 1. 产品概述
 
diff --git a/docs/DEVELOPER.md b/docs/DEVELOPER.md
index 242bbac..c6d497e 100644
--- a/docs/DEVELOPER.md
+++ b/docs/DEVELOPER.md
@@ -8,11 +8,11 @@
 
 ### 后端版本号
 - 文件：`backend/MiaoJiZhang.Api/Program.cs`
-- 变量：`apiVersion = "20260718-1600"`（修改此行即可）
+- 配置：`Build:Version`（未注入时默认为 `dev`）
 - 显示位置：
   - `GET /api/ping` 返回 JSON `{ "version": "...", "built": "..." }`
   - `GET /api/version` 同上
-- 更新方法：修改 `apiVersion` 字符串，重启后端
+- 更新方法：通过环境变量或部署配置注入 `Build__Version`，重启后端
 
 ### Flutter App 版本号
 - 文件：`frontend/lib/shared/version.dart`
@@ -22,9 +22,9 @@
   - 登录页底部
   - 「我的」页底部
 - 构建命令：
-  ```bash
+  ```powershell
   flutter clean
-  flutter build apk --release --dart-define=APP_VERSION=20260718-1600
+  flutter build apk --release --dart-define=APP_VERSION=20260821-135
   ```
   ⚠️ **必须加 `--dart-define`，否则 App 显示 `vdev`**
 
@@ -33,8 +33,7 @@
 - 更新方法：重新构建并完整替换后端静态资源目录。
   ```bash
   cd admin-web && npm run build
-  find ../backend/MiaoJiZhang.Api/wwwroot -mindepth 1 -delete
-  cp -a dist/. ../backend/MiaoJiZhang.Api/wwwroot/
+  Copy-Item -Recurse -Force dist\* ..\backend\MiaoJiZhang.Api\wwwroot\
   ```
 
 ---
@@ -58,11 +57,10 @@ dotnet run --project MiaoJiZhang.Api
 临时设置 `Admin__CookieSecure=false`。
 
 ### 2. Admin Web
-```bash
+```powershell
 cd admin-web
 npm run build
-find ../backend/MiaoJiZhang.Api/wwwroot -mindepth 1 -delete
-cp -a dist/. ../backend/MiaoJiZhang.Api/wwwroot/
+Copy-Item -Recurse -Force dist\* ..\backend\MiaoJiZhang.Api\wwwroot\
 ```
 浏览器打开 `http://localhost:5000/` 或 `http://{电脑IP}:5000/`。如界面未更新请 **Ctrl+Shift+R** 强制刷新。
 
@@ -71,7 +69,7 @@ cp -a dist/. ../backend/MiaoJiZhang.Api/wwwroot/
 cd frontend
 flutter clean
 flutter pub get
-flutter build apk --release --dart-define=APP_VERSION=20260718-1600
+flutter build apk --release --dart-define=APP_VERSION=20260821-135
 adb install -r build/app/outputs/flutter-apk/app-release.apk
 ```
 
@@ -111,10 +109,10 @@ jizhang/
 │       └── features/                     # 业务页面
 ├── admin-web/                            # Vue3 + Ant Design 后台
 │   └── src/
-│       ├── App.vue                       # ★ 侧边栏版本号
+│       ├── App.vue                       # Admin 壳与导航
 │       └── views/                        # 管理页面
-├── docs/                                  # 项目说明、设计规范、开发说明
-└── design/                                # UI 稿、UX 原型、配色探索
+├── design/                                # UI 稿、UX 原型、配色探索
+└── docs/                                  # 项目状态、设计、开发与客户端对接文档
 ```
 
 ---
@@ -136,5 +134,6 @@ jizhang/
 | 修改了代码但 App 不变 | 没有 clean 构建，或没加 dart-define | `flutter clean && flutter build apk --release --dart-define=APP_VERSION=...` |
 | 修改了代码但后台不变 | 后端还在跑旧进程 | 先 `Stop-Process -Name dotnet -Force` 再 `dotnet run` |
 | Admin Web 界面不变 | 浏览器缓存 | Ctrl+Shift+R 强制刷新，或用无痕模式打开 |
+| 数据库结构不一致 | 未执行最新 EF Migration | `dotnet ef database update` 后再启动服务 |
 | Windows 文件路径错误 | 中文路径编码 | 用 python3 读文件时加 `encoding='utf-8'` |
 | sed 破坏代码 | git-bash 的 sed 不兼容 | 禁止用 sed 改 dart/vue 源码，用 Write/Edit 工具 |
diff --git a/docs/PROJECT.md b/docs/PROJECT.md
index d1b230b..f29dbeb 100644
--- a/docs/PROJECT.md
+++ b/docs/PROJECT.md
@@ -1,6 +1,8 @@
 # 喵记账 · 项目骨架
 
-> Flutter 客户端 + .NET 9 后端 · 搭建于 2026-07-18
+> Flutter 客户端 + .NET 9 后端 · 当前状态更新于 2026-08-21
+
+当前实现状态与待办以 [`STATUS.md`](STATUS.md) 为准；本文保留项目入口、运行方式和接口索引。
 
 ## 目录结构
 
@@ -50,7 +52,7 @@ jizhang/
 2. 改 `backend/MiaoJiZhang.Api/appsettings.json` 里的连接串（`your_password`）
 3. 改 `Jwt:Secret` 为 ≥32 字符的随机串
 4. `cd backend && dotnet run --project MiaoJiZhang.Api`
-   - 开发期 `Program.cs` 会 `EnsureCreated` 建表 + 跑种子数据
+   - 数据库结构通过 `MiaoJiZhang.Infrastructure/Persistence/Migrations` 维护；本地首次启动前执行 `dotnet ef database update`
    - OpenAPI 文档：`http://localhost:5000/openapi/v1.json`
 5. 测试注册：
    ```bash
@@ -93,15 +95,18 @@ flutter run
 9. ~~性格设置页~~ ✅（PUT /api/users/me/companion + CompanionPage，形象/性格/三滑杆）
 10. ~~分类管理~~ ✅（POST/DELETE /api/categories + CategoryManagePage，自定义分类增删）
 11. ~~语音/OCR 流程~~ ✅（POST /api/parse + ParseSheet 确认入账；ASR/OCR SDK 接入后自动填充文本）
-12. ~~LLM 接入层~~ ✅（ILlmClient 抽象 + NullLlmClient 回退规则版；对接真实 LLM 时实现该接口即可）
+12. ~~LLM 接入层~~ ✅（已有客户端抽象、权限/额度和回退路径；仍需真实环境联调）
+
+13. ~~Admin Web 后台~~ ✅（配置、分类、AI 形象/性格、表情包、用户、推送、审计与管理员账号页面已存在）
+14. ~~EF Core Migration~~ ✅（已有多次迁移；发布前仍需执行全新库和升级库验证）
 
 ## 遗留（需要外部资源/发布前处理）
 
 - ASR（语音转文字）与拍照 OCR 的 SDK 选型接入（ParseSheet 已留好入口，接入后把识别文本传入即可）
 - 真实 LLM 对接（实现 ILlmClient；性格 Prompt 已在 AiPersona 表可后台调）
 - SVG 图标（category_icon.dart / stickerStyle 集中管理，直接替换映射即可）
-- Admin Web 后台（`docs/DESIGN.md` 第 8 节；实体 AppConfig/AiPersona/AiAvatar/Sticker 已建好）
-- EF Migration 替代 EnsureCreated；Jwt Secret 换生产值；baseUrl 环境化
+- 真实 LLM、OCR/ASR、截图识别和推送供应商的生产配置与联调
+- JWT Secret、管理员引导变量、数据库连接串、API Base URL 和更新下载地址环境化
 
 ## 已完成的接口清单
 
@@ -129,6 +134,6 @@ flutter run
 
 ## 技术债 / 注意
 
-- 后端用 `EnsureCreated` 跳过 Migration，便于快速起盘；正式环境前要切到 `dotnet ef migrations add Init`
-- `appsettings.json` 的 `Jwt:Secret` 是占位值，**生产必须换**
-- 前端 `main_shell.dart` 的 5 个 branch 暂用 `Placeholder()`，下一步逐个填真实页面
+- `Build:Version` 未注入时后端显示 `dev`；发布构建必须显式注入版本。
+- `appsettings.json` 的 JWT、数据库和外部服务配置不能直接用于生产。
+- Admin Web 的 `wwwroot/assets` 是构建生成物；本地构建后不要把临时 hashed 文件混入提交。
diff --git a/docs/STATUS.md b/docs/STATUS.md
new file mode 100644
index 0000000..f2f7063
--- /dev/null
+++ b/docs/STATUS.md
@@ -0,0 +1,71 @@
+# 记之 · 当前项目状态
+
+> 更新时间：2026-08-21
+
+## 总览
+
+项目已经从 UI/接口骨架进入「客户端、后台和服务端能力联调」阶段。当前主干包含 Flutter 客户端、.NET 9 API、Vue 3 管理后台、数据库迁移和自动化测试；`main` 与 `origin/main` 当前指向同一提交 `8828851`。
+
+## 已完成模块
+
+### 后端 API
+
+- 用户注册、登录、JWT、用户资料、引导和双模式切换。
+- 账本、系统/自定义分类、手动记账、月账单、统计、搜索和软删除回收站。
+- AI 聊天、意图识别、AI 直接入账、来源追溯、预算、月报、表情包和 AI 伙伴设置。
+- 文本解析入口、截图识别相关接口、识别幂等和 AI 权限/额度控制。
+- 管理后台 API：品牌配置、系统分类、AI 形象/性格、表情包、用户、推送、管理员账号、审计和密码变更。
+- 账户注销清理、数据导出/恢复、同步冲突和访客数据合并相关服务。
+- EF Core/MySQL 迁移已存在，覆盖初始模型、账户注销、分类颜色、AI 权限、额度、推送基础设施和转账/后台安全等变更。
+
+### Flutter 客户端
+
+- 启动、登录/注册、引导选模式和 AI 伙伴。
+- 普通模式首页、账本切换、手动记账、账单详情/编辑、聊天和全 AI 模式。
+- 统计、AI 月报、预算、搜索、分类管理、伙伴设置、回收站、数据管理和推送设置。
+- 语音/OCR 确认页、截图识别设置/批量导入、识别诊断、离线提示、同步冲突和本地数据导出。
+- 客户端更新检查、推送注册和本地数据库/会话恢复。
+
+当前 `frontend/pubspec.yaml` 版本为 `1.2.5+135`；发布时仍需使用正式构建参数和发布说明。
+
+### Admin Web
+
+已具备登录、强制改密、仪表盘、系统设置、品牌配置、系统分类、AI 性格、AI 形象、表情包、用户、推送、管理员账号和审计页面。管理员角色权限由路由和后端共同控制。
+
+### 测试
+
+- 后端：API 集成测试、推送集成测试、推送供应商测试。
+- Flutter：模型、主题/时间、本地导出、本地转移数据库、更新流程、视觉契约和 Widget 测试。
+
+## 当前待办
+
+### P0：联调与发布阻塞项
+
+- 在真实环境验证 LLM、OCR/ASR、截图识别和推送供应商配置。
+- 验证最新 EF Migration 在全新库、升级库和回滚/重试场景下的行为。
+- 将数据库连接串、JWT Secret、管理员引导变量、API Base URL 和更新下载地址全部改为部署环境注入。
+- 完成 Android 内部构建的截图权限、后台识别、证书和网络安全回归。
+
+### P1：质量与体验
+
+- 对核心流程做端到端回归：注册 → 引导 → 记账 → AI 解析 → 撤销 → 月报/预算。
+- 完善错误提示、离线待同步、同步冲突和外部服务失败时的降级行为。
+- 检查 Admin Web 发布资源生成策略，避免把本地 hashed 静态文件和构建目录带入工作区。
+
+### P2：后续演进
+
+- 完成正式 SVG/插画资源和更多运营内容配置。
+- 补充后台数据看板、脱敏意图失败样本和内容版本回滚。
+- 完成各平台正式签名、应用商店元数据和更新渠道配置。
+
+## 工作区清理记录
+
+2026-08-21 已清理未跟踪的完整备份、历史部署、`.codex-tools` 缓存、Codex 临时构建/补丁目录，以及后端 `wwwroot/assets` 的未跟踪生成资源。源码、`docs/`、设计原型、APK、Android 新代码和测试文件未删除。
+
+## 建议验证顺序
+
+1. 启动 MySQL，执行 `dotnet ef database update`。
+2. 配置后端外部服务和管理员引导变量，运行 API 集成测试。
+3. 构建 Admin Web，验证登录、权限、配置和发布资源。
+4. 运行 Flutter 测试，再构建 `1.2.5+135` 内部包。
+5. 用真实设备验证截图识别、推送、离线同步和更新检查。
diff --git a/frontend/lib/app/app.dart b/frontend/lib/app/app.dart
index e28c7cd..1ebda3b 100644
--- a/frontend/lib/app/app.dart
+++ b/frontend/lib/app/app.dart
@@ -183,6 +183,7 @@ class _MiaoJiAppState extends State<MiaoJiApp> with WidgetsBindingObserver {
   }
 
   Future<void> _resumeServices() async {
+    unawaited(ApiClient.instance.probe());
     await _runSafely(RecognitionImportService.configureNativeContext);
     await _runSafely(RecognitionImportService.importAutomatic);
     await _runSafely(PushService.instance.refresh);
diff --git a/frontend/lib/features/add/add_page.dart b/frontend/lib/features/add/add_page.dart
index 046311a..cfc0eb1 100644
--- a/frontend/lib/features/add/add_page.dart
+++ b/frontend/lib/features/add/add_page.dart
@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
 import 'package:miaoji_zhang/shared/api/api_client.dart';
@@ -7,6 +9,7 @@ import 'package:miaoji_zhang/shared/theme/app_theme.dart';
 import 'package:miaoji_zhang/shared/widgets/app_icons.dart';
 import 'package:miaoji_zhang/shared/widgets/category_icon.dart';
 import 'package:miaoji_zhang/shared/widgets/app_controls.dart';
+import 'package:miaoji_zhang/shared/widgets/backend_status_icon.dart';
 import 'package:miaoji_zhang/shared/services/shanghai_time.dart';
 
 class AddPage extends StatefulWidget {
@@ -36,6 +39,7 @@ class _AddPageState extends State<AddPage> {
   DateTime _occurredAt = ShanghaiTime.now;
   bool _saving = false;
   bool _loadingCategories = true;
+  int _loadRevision = 0;
   String get _categoryType => _tab == 'transfer'
       ? _transferDirection == 'in'
             ? 'income'
@@ -60,7 +64,7 @@ class _AddPageState extends State<AddPage> {
   @override
   void initState() {
     super.initState();
-    _loadCategories();
+    unawaited(_loadCategories());
   }
 
   @override
@@ -71,38 +75,60 @@ class _AddPageState extends State<AddPage> {
   }
 
   Future<void> _loadCategories() async {
-    setState(() => _loadingCategories = true);
-    try {
-      final results = await Future.wait([
-        TxApi.categories('expense'),
-        TxApi.categories('income'),
-      ]);
-      if (!mounted) return;
+    final revision = ++_loadRevision;
+    final expense = TxApi.categoriesLocal('expense');
+    final income = TxApi.categoriesLocal('income');
+    if (mounted) {
       setState(() {
-        _categoriesByType['expense'] = results[0];
-        _categoriesByType['income'] = results[1];
-        if (_selectedByType['expense'] == null && results[0].isNotEmpty) {
-          _selectedByType['expense'] = results[0].first;
-        }
-        if (_selectedByType['income'] == null && results[1].isNotEmpty) {
-          _selectedByType['income'] = results[1].first;
-        }
-        _selectedByType['transfer_out'] ??= results[0].isEmpty
-            ? null
-            : results[0].first;
-        _selectedByType['transfer_in'] ??= results[1].isEmpty
-            ? null
-            : results[1].first;
+        _applyCategories(expense, income);
+        _loadingCategories = false;
       });
-    } catch (error) {
-      if (mounted) {
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(SnackBar(content: Text(apiErrorMessage(error))));
-      }
-    } finally {
-      if (mounted) setState(() => _loadingCategories = false);
     }
+    await Future.wait([
+      TxApi.categoriesRemote('expense').then<void>((values) {
+        if (!mounted || revision != _loadRevision) return;
+        setState(() {
+          _applyCategories(values, _categoriesByType['income'] ?? const []);
+        });
+      }, onError: (_) {}),
+      TxApi.categoriesRemote('income').then<void>((values) {
+        if (!mounted || revision != _loadRevision) return;
+        setState(() {
+          _applyCategories(_categoriesByType['expense'] ?? const [], values);
+        });
+      }, onError: (_) {}),
+    ]);
+  }
+
+  void _applyCategories(List<CategoryItem> expense, List<CategoryItem> income) {
+    _categoriesByType['expense'] = expense;
+    _categoriesByType['income'] = income;
+    _selectedByType['expense'] = _preserveSelection(
+      _selectedByType['expense'],
+      expense,
+    );
+    _selectedByType['income'] = _preserveSelection(
+      _selectedByType['income'],
+      income,
+    );
+    _selectedByType['transfer_out'] = _preserveSelection(
+      _selectedByType['transfer_out'],
+      expense,
+    );
+    _selectedByType['transfer_in'] = _preserveSelection(
+      _selectedByType['transfer_in'],
+      income,
+    );
+  }
+
+  CategoryItem? _preserveSelection(
+    CategoryItem? selected,
+    List<CategoryItem> values,
+  ) {
+    if (values.isEmpty) return null;
+    if (selected == null) return values.first;
+    return values.where((item) => item.id == selected.id).firstOrNull ??
+        values.first;
   }
 
   void _switchTab(String tab) {
@@ -239,6 +265,7 @@ class _AddPageState extends State<AddPage> {
           ),
           onPressed: () => context.pop(),
         ),
+        actions: [BackendStatusIcon(onRetry: _loadCategories)],
       ),
       body: SafeArea(
         child: LayoutBuilder(
diff --git a/frontend/lib/features/home/pages/home_page.dart b/frontend/lib/features/home/pages/home_page.dart
index 7f2b391..1ab7718 100644
--- a/frontend/lib/features/home/pages/home_page.dart
+++ b/frontend/lib/features/home/pages/home_page.dart
@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
 import 'package:miaoji_zhang/shared/api/api_client.dart';
@@ -10,6 +12,7 @@ import 'package:miaoji_zhang/shared/theme/app_theme.dart';
 import 'package:miaoji_zhang/shared/widgets/category_icon.dart';
 import 'package:miaoji_zhang/shared/widgets/app_icons.dart';
 import 'package:miaoji_zhang/shared/widgets/async_error_view.dart';
+import 'package:miaoji_zhang/shared/widgets/backend_status_icon.dart';
 import 'package:miaoji_zhang/features/home/pages/tx_detail_page.dart';
 import 'package:miaoji_zhang/features/home/pages/ledger_sheet.dart';
 import 'package:miaoji_zhang/shared/services/shanghai_time.dart';
@@ -28,6 +31,7 @@ class HomePageState extends State<HomePage> {
   bool _loading = true;
   String? _error;
   late DateTime _month;
+  int _loadRevision = 0;
 
   @override
   void initState() {
@@ -36,7 +40,7 @@ class HomePageState extends State<HomePage> {
     PublicConfigApi.companionNotifier.addListener(_refreshCompanion);
     TransactionEvents.revision.addListener(_refreshTransactions);
     CurrentLedgerStore.instance.addListener(_refreshLedger);
-    refresh();
+    unawaited(refresh());
   }
 
   void _refreshCompanion() {
@@ -60,33 +64,56 @@ class HomePageState extends State<HomePage> {
   }
 
   Future<void> refresh() async {
+    final revision = ++_loadRevision;
     setState(() {
       _loading = true;
       _error = null;
     });
     try {
-      await CurrentLedgerStore.instance.ensureLoaded();
-      final results = await Future.wait<dynamic>([
-        TxApi.month(_month.year, _month.month),
-        BudgetApi.get(_month.year, _month.month),
-      ]);
-      if (mounted) {
+      await CurrentLedgerStore.instance.loadCached();
+      final localSummary = TxApi.monthLocal(_month.year, _month.month);
+      final localBudgets = BudgetApi.getLocal(_month.year, _month.month);
+      if (mounted && revision == _loadRevision) {
         setState(() {
-          _summary = results[0] as MonthSummary;
-          _budgets = results[1] as BudgetsData;
+          _summary = localSummary;
+          _budgets = localBudgets;
         });
       }
     } catch (error) {
-      try {
-        final summary = await TxApi.month(_month.year, _month.month);
-        if (mounted) setState(() => _summary = summary);
-      } catch (fallbackError) {
-        if (mounted) {
-          setState(() => _error = apiErrorMessage(fallbackError));
-        }
+      if (mounted && revision == _loadRevision) {
+        setState(() {
+          _error = apiErrorMessage(error);
+          _loading = false;
+        });
       }
-    } finally {
-      if (mounted) setState(() => _loading = false);
+      return;
+    }
+
+    await Future.wait([
+      () async {
+        try {
+          await CurrentLedgerStore.instance.refreshRemote();
+        } catch (_) {}
+      }(),
+      () async {
+        try {
+          final summary = await TxApi.monthRemote(_month.year, _month.month);
+          if (mounted && revision == _loadRevision) {
+            setState(() => _summary = summary);
+          }
+        } catch (_) {}
+      }(),
+      () async {
+        try {
+          final budgets = await BudgetApi.getRemote(_month.year, _month.month);
+          if (mounted && revision == _loadRevision) {
+            setState(() => _budgets = budgets);
+          }
+        } catch (_) {}
+      }(),
+    ]);
+    if (mounted && revision == _loadRevision) {
+      setState(() => _loading = false);
     }
   }
 
@@ -175,6 +202,7 @@ class HomePageState extends State<HomePage> {
                       ),
                     ),
                     Spacer(),
+                    BackendStatusIcon(onRetry: refresh),
                     IconButton(
                       icon: AppIcons.icon(
                         AppIcons.search,
diff --git a/frontend/lib/features/settings/category_manage_page.dart b/frontend/lib/features/settings/category_manage_page.dart
index 95b296e..caaf531 100644
--- a/frontend/lib/features/settings/category_manage_page.dart
+++ b/frontend/lib/features/settings/category_manage_page.dart
@@ -4,6 +4,7 @@ import 'package:miaoji_zhang/shared/api/business_api.dart';
 import 'package:miaoji_zhang/shared/theme/app_theme.dart';
 import 'package:miaoji_zhang/shared/widgets/app_controls.dart';
 import 'package:miaoji_zhang/shared/widgets/app_icons.dart';
+import 'package:miaoji_zhang/shared/widgets/backend_status_icon.dart';
 import 'package:miaoji_zhang/shared/widgets/category_icon.dart';
 
 class CategoryManagePage extends StatefulWidget {
@@ -20,6 +21,7 @@ class _CategoryManagePageState extends State<CategoryManagePage> {
   bool _reordering = false;
   bool _savingOrder = false;
   bool _orderDirty = false;
+  int _loadRevision = 0;
 
   List<CategoryItem> get _custom =>
       _cats.where((category) => category.isCustom).toList();
@@ -31,19 +33,31 @@ class _CategoryManagePageState extends State<CategoryManagePage> {
   }
 
   Future<void> _load() async {
+    final revision = ++_loadRevision;
     setState(() => _loading = true);
     try {
-      final cats = await TxApi.categories(_type);
-      if (mounted) {
+      final type = _type;
+      final cached = TxApi.categoriesLocal(type);
+      if (mounted && revision == _loadRevision) {
         setState(() {
-          _cats = cats;
+          _cats = cached;
           _orderDirty = false;
+          _loading = false;
         });
       }
+      final remote = await TxApi.categoriesRemote(type);
+      if (mounted && revision == _loadRevision && type == _type) {
+        setState(() => _cats = remote);
+      }
     } catch (error) {
-      if (mounted) _showError(error);
+      if (mounted && revision == _loadRevision && _loading) {
+        setState(() => _loading = false);
+        _showError(error);
+      }
     } finally {
-      if (mounted) setState(() => _loading = false);
+      if (mounted && revision == _loadRevision && _loading) {
+        setState(() => _loading = false);
+      }
     }
   }
 
@@ -424,6 +438,7 @@ class _CategoryManagePageState extends State<CategoryManagePage> {
       appBar: AppBar(
         title: Text('分类管理'),
         actions: [
+          BackendStatusIcon(onRetry: _load),
           if (_custom.length > 1)
             TextButton(
               onPressed: _savingOrder ? null : _toggleReorder,
diff --git a/frontend/lib/features/settings/companion_page.dart b/frontend/lib/features/settings/companion_page.dart
index 2a9ee50..c589546 100644
--- a/frontend/lib/features/settings/companion_page.dart
+++ b/frontend/lib/features/settings/companion_page.dart
@@ -5,6 +5,7 @@ import 'package:miaoji_zhang/shared/api/config_api.dart';
 import 'package:miaoji_zhang/shared/theme/app_theme.dart';
 import 'package:miaoji_zhang/shared/widgets/app_controls.dart';
 import 'package:miaoji_zhang/shared/widgets/app_icons.dart';
+import 'package:miaoji_zhang/shared/widgets/backend_status_icon.dart';
 
 /// AI 性格设置页（P5）：形象/性格从后台 API 动态拉取
 class CompanionPage extends StatefulWidget {
@@ -16,7 +17,9 @@ class CompanionPage extends StatefulWidget {
 class _CompanionPageState extends State<CompanionPage> {
   String _avatar = 'cat', _persona = 'sassy_cat';
   double _roast = 60, _sticker = 70, _proactive = 40;
-  bool _saving = false, _loaded = false;
+  bool _saving = false;
+  bool _refreshing = false;
+  int _loadRevision = 0;
   List<AvatarItem> _avatars = [];
   List<PersonaItem> _personas = [];
 
@@ -40,27 +43,52 @@ class _CompanionPageState extends State<CompanionPage> {
   }
 
   Future<void> _load() async {
-    try {
-      final p = await AuthApi.me();
-      if (mounted && p.aiCompanion != null)
-        setState(() {
-          _avatar = p.aiCompanion!.avatarKey;
-          _persona = p.aiCompanion!.personaKey;
-          _roast = p.aiCompanion!.roastLevel.toDouble();
-          _sticker = p.aiCompanion!.stickerFrequency.toDouble();
-          _proactive = p.aiCompanion!.proactiveLevel.toDouble();
-        });
-    } catch (_) {}
-    try {
-      final av = await PublicConfigApi.avatars();
-      final ps = await PublicConfigApi.personas();
-      if (mounted)
-        setState(() {
-          _avatars = av;
-          _personas = ps;
-        });
-    } catch (_) {}
-    if (mounted) setState(() => _loaded = true);
+    final revision = ++_loadRevision;
+    setState(() => _refreshing = true);
+
+    final cached = await Future.wait<Object?>([
+      AuthApi.cachedCompanion(),
+      PublicConfigApi.cachedAvatars(),
+      PublicConfigApi.cachedPersonas(),
+    ]);
+    if (!mounted || revision != _loadRevision) return;
+    _applyCompanion(cached[0] as AiCompanion?);
+    setState(() {
+      _avatars = cached[1] as List<AvatarItem>;
+      _personas = cached[2] as List<PersonaItem>;
+    });
+
+    await Future.wait([
+      AuthApi.me(forceRemote: true).then<void>((profile) {
+        if (mounted && revision == _loadRevision) {
+          _applyCompanion(profile.aiCompanion);
+        }
+      }, onError: (_) {}),
+      PublicConfigApi.avatars().then<void>((values) {
+        if (mounted && revision == _loadRevision) {
+          setState(() => _avatars = values);
+        }
+      }, onError: (_) {}),
+      PublicConfigApi.personas().then<void>((values) {
+        if (mounted && revision == _loadRevision) {
+          setState(() => _personas = values);
+        }
+      }, onError: (_) {}),
+    ]);
+    if (mounted && revision == _loadRevision) {
+      setState(() => _refreshing = false);
+    }
+  }
+
+  void _applyCompanion(AiCompanion? companion) {
+    if (companion == null || !mounted) return;
+    setState(() {
+      _avatar = companion.avatarKey;
+      _persona = companion.personaKey;
+      _roast = companion.roastLevel.toDouble();
+      _sticker = companion.stickerFrequency.toDouble();
+      _proactive = companion.proactiveLevel.toDouble();
+    });
   }
 
   Future<void> _save() async {
@@ -80,26 +108,20 @@ class _CompanionPageState extends State<CompanionPage> {
         context,
       ).showSnackBar(const SnackBar(content: Text('已保存')));
     } catch (e) {
-      if (mounted)
+      if (mounted) {
         ScaffoldMessenger.of(
           context,
         ).showSnackBar(SnackBar(content: Text(apiErrorMessage(e))));
+      }
     } finally {
-      if (mounted) setState(() => _saving = false);
+      if (mounted) {
+        setState(() => _saving = false);
+      }
     }
   }
 
   @override
   Widget build(BuildContext context) {
-    if (!_loaded)
-      return const Scaffold(
-        body: Center(
-          child: CircularProgressIndicator(
-            color: AppTheme.primary,
-            strokeWidth: 2,
-          ),
-        ),
-      );
     final avatars = _avatars.isNotEmpty
         ? _avatars
               .map(
@@ -122,7 +144,16 @@ class _CompanionPageState extends State<CompanionPage> {
         : _fallbackPersonas;
 
     return Scaffold(
-      appBar: AppBar(title: Text('AI 性格设置')),
+      appBar: AppBar(
+        title: Text('AI 性格设置'),
+        actions: [BackendStatusIcon(onRetry: _load)],
+        bottom: _refreshing
+            ? const PreferredSize(
+                preferredSize: Size.fromHeight(2),
+                child: LinearProgressIndicator(minHeight: 2),
+              )
+            : null,
+      ),
       body: ListView(
         padding: const EdgeInsets.all(16),
         children: [
@@ -236,19 +267,24 @@ class _CompanionPageState extends State<CompanionPage> {
             ),
           ),
           SizedBox(height: 16),
-          ElevatedButton(
-            style: ElevatedButton.styleFrom(backgroundColor: AppTheme.ai),
-            onPressed: _saving ? null : _save,
-            child: _saving
-                ? SizedBox(
-                    width: 20,
-                    height: 20,
-                    child: CircularProgressIndicator(
-                      strokeWidth: 2,
-                      color: Colors.white,
-                    ),
-                  )
-                : Text('保存设置'),
+          ValueListenableBuilder<BackendAvailability>(
+            valueListenable: ApiClient.availability,
+            builder: (context, availability, _) => ElevatedButton(
+              style: ElevatedButton.styleFrom(backgroundColor: AppTheme.ai),
+              onPressed: availability == BackendAvailability.online && !_saving
+                  ? _save
+                  : null,
+              child: _saving
+                  ? SizedBox(
+                      width: 20,
+                      height: 20,
+                      child: CircularProgressIndicator(
+                        strokeWidth: 2,
+                        color: Colors.white,
+                      ),
+                    )
+                  : Text('保存设置'),
+            ),
           ),
         ],
       ),
diff --git a/frontend/lib/features/settings/recycle_bin_page.dart b/frontend/lib/features/settings/recycle_bin_page.dart
index 0eb1d13..279687d 100644
--- a/frontend/lib/features/settings/recycle_bin_page.dart
+++ b/frontend/lib/features/settings/recycle_bin_page.dart
@@ -6,6 +6,7 @@ import 'package:miaoji_zhang/shared/services/transaction_events.dart';
 import 'package:miaoji_zhang/shared/theme/app_theme.dart';
 import 'package:miaoji_zhang/shared/widgets/category_icon.dart';
 import 'package:miaoji_zhang/shared/widgets/app_controls.dart';
+import 'package:miaoji_zhang/shared/widgets/backend_status_icon.dart';
 
 class RecycleBinPage extends StatefulWidget {
   const RecycleBinPage({super.key});
@@ -17,6 +18,7 @@ class RecycleBinPage extends StatefulWidget {
 class _RecycleBinPageState extends State<RecycleBinPage> {
   List<TxItem> _items = const [];
   bool _loading = true;
+  int _loadRevision = 0;
 
   @override
   void initState() {
@@ -25,15 +27,30 @@ class _RecycleBinPageState extends State<RecycleBinPage> {
   }
 
   Future<void> _load() async {
+    final revision = ++_loadRevision;
     setState(() => _loading = true);
     try {
-      await CurrentLedgerStore.instance.ensureLoaded();
-      final items = await TxApi.recycleBin();
-      if (mounted) setState(() => _items = items);
+      await CurrentLedgerStore.instance.loadCached();
+      final cached = TxApi.recycleBinLocal();
+      if (mounted && revision == _loadRevision) {
+        setState(() {
+          _items = cached;
+          _loading = false;
+        });
+      }
+      final remote = await TxApi.recycleBinRemote();
+      if (mounted && revision == _loadRevision) {
+        setState(() => _items = remote);
+      }
     } catch (error) {
-      if (mounted) _showError(error);
+      if (mounted && revision == _loadRevision && _loading) {
+        setState(() => _loading = false);
+        _showError(error);
+      }
     } finally {
-      if (mounted) setState(() => _loading = false);
+      if (mounted && revision == _loadRevision && _loading) {
+        setState(() => _loading = false);
+      }
     }
   }
 
@@ -48,6 +65,7 @@ class _RecycleBinPageState extends State<RecycleBinPage> {
   }
 
   Future<void> _permanentDelete(TxItem item) async {
+    if (ApiClient.availability.value != BackendAvailability.online) return;
     final confirmed = await _confirm('永久删除', '永久删除后无法恢复，聊天中的账单卡片会显示为已删除。');
     if (!confirmed) return;
     try {
@@ -59,7 +77,10 @@ class _RecycleBinPageState extends State<RecycleBinPage> {
   }
 
   Future<void> _clear() async {
-    if (_items.isEmpty) return;
+    if (_items.isEmpty ||
+        ApiClient.availability.value != BackendAvailability.online) {
+      return;
+    }
     final confirmed = await _confirm('清空回收站', '将永久删除当前账本回收站中的全部账单，无法恢复。');
     if (!confirmed) return;
     try {
@@ -79,12 +100,14 @@ class _RecycleBinPageState extends State<RecycleBinPage> {
   );
 
   Future<void> _showActions(TxItem item) async {
+    final online = ApiClient.availability.value == BackendAvailability.online;
     final action = await showJzOptionSheet<String>(
       context,
       title: item.note ?? item.categoryName,
-      options: const [
-        JzOption(value: 'restore', label: '恢复账单'),
-        JzOption(value: 'delete', label: '永久删除', subtitle: '删除后无法恢复'),
+      options: [
+        const JzOption(value: 'restore', label: '恢复账单'),
+        if (online)
+          const JzOption(value: 'delete', label: '永久删除', subtitle: '删除后无法恢复'),
       ],
     );
     if (action == 'restore') await _restore(item);
@@ -103,9 +126,16 @@ class _RecycleBinPageState extends State<RecycleBinPage> {
       appBar: AppBar(
         title: Text('${CurrentLedgerStore.instance.currentName} · 回收站'),
         actions: [
-          TextButton(
-            onPressed: _items.isEmpty ? null : _clear,
-            child: Text('清空'),
+          BackendStatusIcon(onRetry: _load),
+          ValueListenableBuilder<BackendAvailability>(
+            valueListenable: ApiClient.availability,
+            builder: (context, availability, _) => TextButton(
+              onPressed:
+                  _items.isEmpty || availability != BackendAvailability.online
+                  ? null
+                  : _clear,
+              child: Text('清空'),
+            ),
           ),
         ],
       ),
diff --git a/frontend/lib/features/stats/report_page.dart b/frontend/lib/features/stats/report_page.dart
index edf54fc..1547c69 100644
--- a/frontend/lib/features/stats/report_page.dart
+++ b/frontend/lib/features/stats/report_page.dart
@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:miaoji_zhang/shared/api/api_client.dart';
 import 'package:miaoji_zhang/shared/api/business_api.dart';
@@ -6,6 +8,7 @@ import 'package:miaoji_zhang/shared/services/current_ledger_store.dart';
 import 'package:miaoji_zhang/shared/theme/app_theme.dart';
 import 'package:miaoji_zhang/shared/widgets/app_icons.dart';
 import 'package:miaoji_zhang/shared/widgets/async_error_view.dart';
+import 'package:miaoji_zhang/shared/widgets/backend_status_icon.dart';
 import 'package:miaoji_zhang/shared/widgets/category_icon.dart';
 import 'package:miaoji_zhang/shared/services/shanghai_time.dart';
 import 'package:miaoji_zhang/shared/services/session_store.dart';
@@ -25,13 +28,14 @@ class _ReportPageState extends State<ReportPage> {
   String? _error;
   DateTime _anchor = ShanghaiTime.now;
   _ReportKind _kind = _ReportKind.monthly;
+  int _loadRevision = 0;
 
   @override
   void initState() {
     super.initState();
     PublicConfigApi.companionNotifier.addListener(_refreshCompanion);
     CurrentLedgerStore.instance.addListener(_load);
-    _load();
+    unawaited(_load());
   }
 
   @override
@@ -46,24 +50,33 @@ class _ReportPageState extends State<ReportPage> {
   }
 
   Future<void> _load() async {
+    final revision = ++_loadRevision;
     setState(() {
       _loading = true;
       _error = null;
     });
     try {
-      final report = switch (_kind) {
-        _ReportKind.weekly => await ReportApi.weekly(_anchor),
-        _ReportKind.monthly => await ReportApi.monthlyPeriod(
-          _anchor.year,
-          _anchor.month,
-        ),
-        _ReportKind.yearly => await ReportApi.yearly(_anchor.year),
+      final period = switch (_kind) {
+        _ReportKind.weekly => 'week',
+        _ReportKind.monthly => 'month',
+        _ReportKind.yearly => 'year',
       };
-      if (mounted) setState(() => _report = report);
+      final local = ReportApi.local(period, _anchor);
+      if (mounted && revision == _loadRevision) {
+        setState(() => _report = local);
+      }
+      final remote = await ReportApi.remote(period, _anchor);
+      if (mounted && revision == _loadRevision) {
+        setState(() => _report = remote);
+      }
     } catch (error) {
-      if (mounted) setState(() => _error = apiErrorMessage(error));
+      if (mounted && revision == _loadRevision && _report == null) {
+        setState(() => _error = apiErrorMessage(error));
+      }
     } finally {
-      if (mounted) setState(() => _loading = false);
+      if (mounted && revision == _loadRevision) {
+        setState(() => _loading = false);
+      }
     }
   }
 
@@ -108,6 +121,7 @@ class _ReportPageState extends State<ReportPage> {
     return Scaffold(
       appBar: AppBar(
         title: Text(SessionStore.instance.aiEnabled ? 'AI 报告' : '报告'),
+        actions: [BackendStatusIcon(onRetry: _load)],
       ),
       body: Column(
         children: [
diff --git a/frontend/lib/features/stats/stats_page.dart b/frontend/lib/features/stats/stats_page.dart
index 5480af5..e26e2cf 100644
--- a/frontend/lib/features/stats/stats_page.dart
+++ b/frontend/lib/features/stats/stats_page.dart
@@ -1,4 +1,5 @@
 import 'dart:math' as math;
+import 'dart:async';
 import 'package:miaoji_zhang/shared/services/shanghai_time.dart';
 
 import 'package:flutter/material.dart';
@@ -8,6 +9,7 @@ import 'package:miaoji_zhang/shared/services/current_ledger_store.dart';
 import 'package:miaoji_zhang/shared/theme/app_theme.dart';
 import 'package:miaoji_zhang/shared/widgets/app_controls.dart';
 import 'package:miaoji_zhang/shared/widgets/async_error_view.dart';
+import 'package:miaoji_zhang/shared/widgets/backend_status_icon.dart';
 import 'package:miaoji_zhang/shared/widgets/category_icon.dart';
 
 class StatsPage extends StatefulWidget {
@@ -23,12 +25,13 @@ class _StatsPageState extends State<StatsPage> {
   PeriodStats? _stats;
   String? _error;
   bool _loading = true;
+  int _loadRevision = 0;
 
   @override
   void initState() {
     super.initState();
     CurrentLedgerStore.instance.addListener(_load);
-    _load();
+    unawaited(_load());
   }
 
   @override
@@ -38,6 +41,7 @@ class _StatsPageState extends State<StatsPage> {
   }
 
   Future<void> _load() async {
+    final revision = ++_loadRevision;
     if (mounted) {
       setState(() {
         _loading = true;
@@ -45,12 +49,25 @@ class _StatsPageState extends State<StatsPage> {
       });
     }
     try {
-      final stats = await TxApi.periodStats(_period, _anchor);
-      if (mounted) setState(() => _stats = stats);
+      final local = TxApi.periodStatsLocal(_period, _anchor);
+      if (mounted && revision == _loadRevision) {
+        setState(() => _stats = local);
+      }
     } catch (error) {
-      if (mounted) setState(() => _error = apiErrorMessage(error));
+      if (mounted && revision == _loadRevision) {
+        setState(() => _error = apiErrorMessage(error));
+      }
+    }
+    try {
+      final remote = await TxApi.periodStatsRemote(_period, _anchor);
+      if (mounted && revision == _loadRevision) {
+        setState(() => _stats = remote);
+      }
+    } catch (_) {
     } finally {
-      if (mounted) setState(() => _loading = false);
+      if (mounted && revision == _loadRevision) {
+        setState(() => _loading = false);
+      }
     }
   }
 
@@ -93,7 +110,10 @@ class _StatsPageState extends State<StatsPage> {
   Widget build(BuildContext context) {
     final stats = _stats;
     return Scaffold(
-      appBar: AppBar(title: Text('统计')),
+      appBar: AppBar(
+        title: Text('统计'),
+        actions: [BackendStatusIcon(onRetry: _load)],
+      ),
       body: Column(
         children: [
           Padding(
@@ -105,7 +125,7 @@ class _StatsPageState extends State<StatsPage> {
                 JzOption(value: 'month', label: '月'),
                 JzOption(value: 'year', label: '年'),
               ],
-              onChanged: _loading ? null : _selectPeriod,
+              onChanged: _selectPeriod,
             ),
           ),
           Expanded(
@@ -171,7 +191,7 @@ class _StatsPageState extends State<StatsPage> {
       children: [
         IconButton(
           tooltip: '上一个周期',
-          onPressed: _loading ? null : () => _shift(-1),
+          onPressed: () => _shift(-1),
           icon: Icon(Icons.chevron_left_rounded),
         ),
         SizedBox(
@@ -184,9 +204,7 @@ class _StatsPageState extends State<StatsPage> {
         ),
         IconButton(
           tooltip: '下一个周期',
-          onPressed: _loading || _isAfterCurrentPeriod(nextAnchor)
-              ? null
-              : () => _shift(1),
+          onPressed: _isAfterCurrentPeriod(nextAnchor) ? null : () => _shift(1),
           icon: Icon(Icons.chevron_right_rounded),
         ),
       ],
diff --git a/frontend/lib/shared/api/api_client.dart b/frontend/lib/shared/api/api_client.dart
index e03ed03..d002bcb 100644
--- a/frontend/lib/shared/api/api_client.dart
+++ b/frontend/lib/shared/api/api_client.dart
@@ -4,6 +4,8 @@ import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:miaoji_zhang/shared/api/backend_identity.dart';
 import 'package:miaoji_zhang/shared/services/session_store.dart';
 
+enum BackendAvailability { unknown, online, offline }
+
 class ApiClient {
   ApiClient._();
   static final ApiClient instance = ApiClient._();
@@ -12,6 +14,9 @@ class ApiClient {
   static const _legacyTokenKey = 'auth_token';
   static final _tokenKey = 'auth_token_${BackendIdentity.scope}';
   static final sessionExpired = ValueNotifier<int>(0);
+  static final availability = ValueNotifier<BackendAvailability>(
+    BackendAvailability.unknown,
+  );
   static bool _handlingUnauthorized = false;
 
   static const String baseUrl = BackendIdentity.baseUrl;
@@ -31,6 +36,10 @@ class ApiClient {
           )
           ..interceptors.add(
             InterceptorsWrapper(
+              onResponse: (response, handler) {
+                availability.value = BackendAvailability.online;
+                handler.next(response);
+              },
               onRequest: (options, handler) async {
                 final token = await _storage.read(key: _tokenKey);
                 if (token != null) {
@@ -39,6 +48,11 @@ class ApiClient {
                 handler.next(options);
               },
               onError: (error, handler) async {
+                if (isConnectivityError(error)) {
+                  availability.value = BackendAvailability.offline;
+                } else if (error.response != null) {
+                  availability.value = BackendAvailability.online;
+                }
                 final unauthorized = error.response?.statusCode == 401;
                 final data = error.response?.data;
                 final aiDenied =
@@ -74,6 +88,18 @@ class ApiClient {
   }
 
   Future<String?> readToken() => _storage.read(key: _tokenKey);
+
+  Future<void> probe() async {
+    try {
+      await dio.get<void>(
+        '/api/public/brand',
+        options: Options(receiveTimeout: const Duration(seconds: 10)),
+      );
+    } catch (_) {
+      // The interceptor owns the reachability state transition.
+    }
+  }
+
   Future<void> clearToken() async {
     await _storage.delete(key: _tokenKey);
     await _storage.delete(key: _legacyTokenKey);
@@ -91,8 +117,9 @@ String apiErrorMessage(Object e) {
   if (e is StateError) return e.message;
   if (e is DioException) {
     final data = e.response?.data;
-    if (data is Map && data['message'] != null)
+    if (data is Map && data['message'] != null) {
       return data['message'] as String;
+    }
     if (e.type == DioExceptionType.connectionTimeout ||
         e.type == DioExceptionType.connectionError ||
         e.type == DioExceptionType.receiveTimeout) {
diff --git a/frontend/lib/shared/api/auth_api.dart b/frontend/lib/shared/api/auth_api.dart
index f012355..01cf5bc 100644
--- a/frontend/lib/shared/api/auth_api.dart
+++ b/frontend/lib/shared/api/auth_api.dart
@@ -1,5 +1,9 @@
+import 'dart:convert';
+
 import 'package:dio/dio.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 import 'package:miaoji_zhang/shared/api/api_client.dart';
+import 'package:miaoji_zhang/shared/api/backend_identity.dart';
 import 'package:miaoji_zhang/shared/services/current_ledger_store.dart';
 import 'package:miaoji_zhang/shared/services/local_export_service.dart';
 import 'package:miaoji_zhang/shared/services/session_store.dart';
@@ -19,6 +23,15 @@ class AiCompanion {
       roastLevel = json['roastLevel'] as int,
       stickerFrequency = json['stickerFrequency'] as int,
       proactiveLevel = json['proactiveLevel'] as int;
+
+  Map<String, dynamic> toJson() => {
+    'avatarKey': avatarKey,
+    'personaKey': personaKey,
+    'customName': customName,
+    'roastLevel': roastLevel,
+    'stickerFrequency': stickerFrequency,
+    'proactiveLevel': proactiveLevel,
+  };
 }
 
 class UserProfile {
@@ -49,8 +62,9 @@ class UserProfile {
     required this.nickname,
     required this.appMode,
     required this.onboardingDone,
+    this.aiCompanion,
     this.aiEnabled = false,
-  }) : aiCompanion = null;
+  });
 }
 
 class AuthLoginResult {
@@ -120,6 +134,20 @@ class AuthApi {
     }
   }
 
+  static Future<AiCompanion?> cachedCompanion() async {
+    final userId = SessionStore.instance.userId;
+    if (userId == null) return null;
+    final value = (await SharedPreferences.getInstance()).getString(
+      _companionCacheKey(userId),
+    );
+    if (value == null) return null;
+    try {
+      return AiCompanion.fromJson(jsonDecode(value) as Map<String, dynamic>);
+    } catch (_) {
+      return null;
+    }
+  }
+
   static Future<UserProfile> completeOnboarding({
     required String appMode,
     required String avatarKey,
@@ -272,13 +300,24 @@ class AuthApi {
     );
   }
 
-  static Future<void> _cacheProfile(UserProfile profile) =>
-      SessionStore.instance.activateAccount(
-        userId: profile.userId,
-        username: profile.username,
-        nickname: profile.nickname,
-        appMode: profile.appMode,
-        onboardingDone: profile.onboardingDone,
-        aiEnabled: profile.aiEnabled,
+  static Future<void> _cacheProfile(UserProfile profile) async {
+    await SessionStore.instance.activateAccount(
+      userId: profile.userId,
+      username: profile.username,
+      nickname: profile.nickname,
+      appMode: profile.appMode,
+      onboardingDone: profile.onboardingDone,
+      aiEnabled: profile.aiEnabled,
+    );
+    final companion = profile.aiCompanion;
+    if (companion != null) {
+      await (await SharedPreferences.getInstance()).setString(
+        _companionCacheKey(profile.userId),
+        jsonEncode(companion.toJson()),
       );
+    }
+  }
+
+  static String _companionCacheKey(int userId) =>
+      'ai_companion_${BackendIdentity.scope}_$userId';
 }
diff --git a/frontend/lib/shared/api/business_api.dart b/frontend/lib/shared/api/business_api.dart
index 6709595..b25355f 100644
--- a/frontend/lib/shared/api/business_api.dart
+++ b/frontend/lib/shared/api/business_api.dart
@@ -244,6 +244,20 @@ class TxApi {
   static bool get _queueOfflineChanges =>
       SessionStore.instance.isAccount && SessionStore.instance.cloudSyncEnabled;
 
+  static MonthSummary monthLocal(int year, int month) => MonthSummary.fromJson(
+    LocalDatabase.instance.monthSummary(year, month, _ledgerId),
+  );
+
+  static Future<MonthSummary> monthRemote(int year, int month) async {
+    final response = await _dio.get(
+      '/api/transactions/month',
+      queryParameters: {'year': year, 'month': month, 'ledgerId': _ledgerId},
+    );
+    final json = response.data as Map<String, dynamic>;
+    LocalDatabase.instance.cacheMonthSummary(json);
+    return MonthSummary.fromJson(json);
+  }
+
   static Future<MonthSummary> month(int year, int month) async {
     final session = SessionStore.instance;
     if (session.shouldUseLocalOnly) {
@@ -330,6 +344,29 @@ class TxApi {
     }
   }
 
+  static PeriodStats periodStatsLocal(String period, DateTime anchor) =>
+      PeriodStats.fromJson(
+        LocalDatabase.instance.periodStats(period, anchor, _ledgerId),
+      );
+
+  static Future<PeriodStats> periodStatsRemote(
+    String period,
+    DateTime anchor,
+  ) async {
+    final response = await _dio.get(
+      '/api/transactions/stats/period',
+      queryParameters: {
+        'period': period,
+        'anchor':
+            '${anchor.year.toString().padLeft(4, '0')}-'
+            '${anchor.month.toString().padLeft(2, '0')}-'
+            '${anchor.day.toString().padLeft(2, '0')}',
+        'ledgerId': _ledgerId,
+      },
+    );
+    return PeriodStats.fromJson(response.data as Map<String, dynamic>);
+  }
+
   static Future<List<CategoryItem>> categories(String type) async {
     final session = SessionStore.instance;
     if (session.shouldUseLocalOnly) {
@@ -357,6 +394,24 @@ class TxApi {
     }
   }
 
+  static List<CategoryItem> categoriesLocal(String type) => LocalDatabase
+      .instance
+      .categories(type)
+      .map(CategoryItem.fromJson)
+      .toList();
+
+  static Future<List<CategoryItem>> categoriesRemote(String type) async {
+    final response = await _dio.get(
+      '/api/categories',
+      queryParameters: {'type': type},
+    );
+    final values = response.data as List;
+    LocalDatabase.instance.cacheCategories(values, replaceType: type);
+    return values
+        .map((item) => CategoryItem.fromJson(item as Map<String, dynamic>))
+        .toList();
+  }
+
   static Future<TxItem> create({
     required int categoryId,
     required String type,
@@ -532,7 +587,9 @@ class TxApi {
       includeDeleted: true,
     )?['updatedAt'];
     final session = SessionStore.instance;
-    if (session.shouldUseLocalOnly || id < 0) {
+    if (session.shouldUseLocalOnly ||
+        ApiClient.availability.value == BackendAvailability.offline ||
+        id < 0) {
       LocalDatabase.instance.softDeleteTransaction(id);
       if (_queueOfflineChanges) {
         LocalDatabase.instance.enqueueSync('transaction', id, 'delete', {
@@ -613,7 +670,8 @@ class TxApi {
 
   static Future<List<TxItem>> recycleBin() async {
     final session = SessionStore.instance;
-    if (session.shouldUseLocalOnly) {
+    if (session.shouldUseLocalOnly ||
+        ApiClient.availability.value == BackendAvailability.offline) {
       return LocalDatabase.instance
           .recycleBin(_ledgerId)
           .map(TxItem.fromJson)
@@ -638,13 +696,32 @@ class TxApi {
     }
   }
 
+  static List<TxItem> recycleBinLocal() => LocalDatabase.instance
+      .recycleBin(_ledgerId)
+      .map(TxItem.fromJson)
+      .toList();
+
+  static Future<List<TxItem>> recycleBinRemote() async {
+    final response = await _dio.get(
+      '/api/transactions/recycle-bin',
+      queryParameters: {'ledgerId': _ledgerId},
+    );
+    final values = response.data as List;
+    LocalDatabase.instance.cacheTransactions(values);
+    return values
+        .map((item) => TxItem.fromJson(item as Map<String, dynamic>))
+        .toList();
+  }
+
   static Future<TxItem> restore(int id) async {
     final baseUpdatedAt = LocalDatabase.instance.transaction(
       id,
       includeDeleted: true,
     )?['updatedAt'];
     final session = SessionStore.instance;
-    if (session.shouldUseLocalOnly || id < 0) {
+    if (session.shouldUseLocalOnly ||
+        ApiClient.availability.value == BackendAvailability.offline ||
+        id < 0) {
       final local = LocalDatabase.instance.restoreTransaction(id);
       if (_queueOfflineChanges) {
         LocalDatabase.instance.enqueueSync('transaction', id, 'restore', {
@@ -984,6 +1061,18 @@ class BudgetApi {
   static final _dio = ApiClient.instance.dio;
   static int get _ledgerId => CurrentLedgerStore.instance.currentId ?? 1;
 
+  static BudgetsData getLocal(int year, int month) => BudgetsData.fromJson(
+    LocalDatabase.instance.budgets(year, month, _ledgerId),
+  );
+
+  static Future<BudgetsData> getRemote(int year, int month) async {
+    final response = await _dio.get(
+      '/api/budgets',
+      queryParameters: {'year': year, 'month': month, 'ledgerId': _ledgerId},
+    );
+    return BudgetsData.fromJson(response.data as Map<String, dynamic>);
+  }
+
   static Future<BudgetsData> get(int year, int month) async {
     final session = SessionStore.instance;
     if (session.shouldUseLocalOnly) {
@@ -1294,6 +1383,29 @@ class ReportApi {
   static final _dio = ApiClient.instance.dio;
   static int get _ledgerId => CurrentLedgerStore.instance.currentId ?? 1;
 
+  static PeriodReport local(String period, DateTime anchor) =>
+      _localPeriod(period, anchor);
+
+  static Future<PeriodReport> remote(String period, DateTime anchor) async {
+    if (period == 'month') {
+      return PeriodReport.fromMonthly(await monthly(anchor.year, anchor.month));
+    }
+    final path = period == 'week'
+        ? '/api/reports/weekly'
+        : '/api/reports/yearly';
+    final query = period == 'week'
+        ? {
+            'date':
+                '${anchor.year.toString().padLeft(4, '0')}-'
+                '${anchor.month.toString().padLeft(2, '0')}-'
+                '${anchor.day.toString().padLeft(2, '0')}',
+            'ledgerId': _ledgerId,
+          }
+        : {'year': anchor.year, 'ledgerId': _ledgerId};
+    final response = await _dio.get(path, queryParameters: query);
+    return PeriodReport.fromJson(response.data as Map<String, dynamic>);
+  }
+
   static Future<PeriodReport> weekly(DateTime date) async {
     if (SessionStore.instance.shouldUseLocalOnly) {
       return _localPeriod('week', date);
@@ -1595,7 +1707,8 @@ class CategoryApi {
       'type': type,
     };
     final session = SessionStore.instance;
-    if (session.shouldUseLocalOnly) {
+    if (session.shouldUseLocalOnly ||
+        ApiClient.availability.value == BackendAvailability.offline) {
       final local = LocalDatabase.instance.createCategory(
         name,
         iconKey,
@@ -1649,7 +1762,9 @@ class CategoryApi {
       'sortOrder': sortOrder,
     };
     final session = SessionStore.instance;
-    if (session.shouldUseLocalOnly || id < 0) {
+    if (session.shouldUseLocalOnly ||
+        ApiClient.availability.value == BackendAvailability.offline ||
+        id < 0) {
       final local = LocalDatabase.instance.updateCategory(
         id,
         name,
@@ -1662,16 +1777,31 @@ class CategoryApi {
       }
       return CategoryItem.fromJson(local);
     }
-    final response = await _dio.put('/api/categories/$id', data: payload);
-    final json = response.data as Map<String, dynamic>;
-    LocalDatabase.instance.cacheCategories([json]);
-    return CategoryItem.fromJson(json);
+    try {
+      final response = await _dio.put('/api/categories/$id', data: payload);
+      final json = response.data as Map<String, dynamic>;
+      LocalDatabase.instance.cacheCategories([json]);
+      return CategoryItem.fromJson(json);
+    } catch (error) {
+      if (!isConnectivityError(error) || !session.isAccount) rethrow;
+      final local = LocalDatabase.instance.updateCategory(
+        id,
+        name,
+        iconKey,
+        colorKey,
+        sortOrder,
+      );
+      LocalDatabase.instance.enqueueSync('category', id, 'update', payload);
+      return CategoryItem.fromJson(local);
+    }
   }
 
   static Future<void> reorder(String type, List<int> categoryIds) async {
     LocalDatabase.instance.reorderCategories(type, categoryIds);
     final session = SessionStore.instance;
-    if (session.shouldUseLocalOnly || categoryIds.any((id) => id < 0)) {
+    if (session.shouldUseLocalOnly ||
+        ApiClient.availability.value == BackendAvailability.offline ||
+        categoryIds.any((id) => id < 0)) {
       if (session.isAccount && session.cloudSyncEnabled) {
         LocalDatabase.instance.enqueueSync('category', 0, 'reorder', {
           'type': type,
@@ -1680,15 +1810,25 @@ class CategoryApi {
       }
       return;
     }
-    await _dio.put(
-      '/api/categories/reorder',
-      data: {'type': type, 'categoryIds': categoryIds},
-    );
+    try {
+      await _dio.put(
+        '/api/categories/reorder',
+        data: {'type': type, 'categoryIds': categoryIds},
+      );
+    } catch (error) {
+      if (!isConnectivityError(error) || !session.isAccount) rethrow;
+      LocalDatabase.instance.enqueueSync('category', 0, 'reorder', {
+        'type': type,
+        'categoryIds': categoryIds,
+      });
+    }
   }
 
   static Future<void> delete(int id) async {
     final session = SessionStore.instance;
-    if (session.shouldUseLocalOnly || id < 0) {
+    if (session.shouldUseLocalOnly ||
+        ApiClient.availability.value == BackendAvailability.offline ||
+        id < 0) {
       LocalDatabase.instance.deleteCategory(id);
       if (session.isAccount && session.cloudSyncEnabled) {
         LocalDatabase.instance.enqueueSync('category', id, 'delete', {
@@ -1697,7 +1837,13 @@ class CategoryApi {
       }
       return;
     }
-    await _dio.delete('/api/categories/$id');
-    LocalDatabase.instance.deleteCategory(id);
+    try {
+      await _dio.delete('/api/categories/$id');
+      LocalDatabase.instance.deleteCategory(id);
+    } catch (error) {
+      if (!isConnectivityError(error) || !session.isAccount) rethrow;
+      LocalDatabase.instance.deleteCategory(id);
+      LocalDatabase.instance.enqueueSync('category', id, 'delete', {'id': id});
+    }
   }
 }
diff --git a/frontend/lib/shared/api/config_api.dart b/frontend/lib/shared/api/config_api.dart
index 2a98446..57596d6 100644
--- a/frontend/lib/shared/api/config_api.dart
+++ b/frontend/lib/shared/api/config_api.dart
@@ -1,5 +1,9 @@
+import 'dart:convert';
+
 import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 import 'package:miaoji_zhang/shared/api/api_client.dart';
+import 'package:miaoji_zhang/shared/api/backend_identity.dart';
 import 'package:miaoji_zhang/shared/services/session_store.dart';
 
 class BrandConfig {
@@ -41,6 +45,13 @@ class AvatarItem {
       defaultName = j['defaultName'] as String,
       speechTic = j['speechTic'] as String? ?? '',
       imageUrl = j['imageUrl'] as String?;
+
+  Map<String, dynamic> toJson() => {
+    'key': key,
+    'defaultName': defaultName,
+    'speechTic': speechTic,
+    'imageUrl': imageUrl,
+  };
 }
 
 class PersonaItem {
@@ -50,6 +61,13 @@ class PersonaItem {
       name = j['name'] as String,
       description = j['description'] as String? ?? '',
       sampleLine = j['sampleLine'] as String? ?? '';
+
+  Map<String, dynamic> toJson() => {
+    'key': key,
+    'name': name,
+    'description': description,
+    'sampleLine': sampleLine,
+  };
 }
 
 class CompanionDisplay {
@@ -145,16 +163,59 @@ class PublicConfigApi {
 
   static Future<List<AvatarItem>> avatars() async {
     final res = await _dio.get('/api/public/avatars');
-    return (res.data as List)
+    final values = (res.data as List)
         .map((e) => AvatarItem.fromJson(e as Map<String, dynamic>))
         .toList();
+    await _cacheCatalog(
+      _avatarCacheKey,
+      values.map((e) => e.toJson()).toList(),
+    );
+    return values;
   }
 
   static Future<List<PersonaItem>> personas() async {
     final res = await _dio.get('/api/public/personas');
-    return (res.data as List)
+    final values = (res.data as List)
         .map((e) => PersonaItem.fromJson(e as Map<String, dynamic>))
         .toList();
+    await _cacheCatalog(
+      _personaCacheKey,
+      values.map((e) => e.toJson()).toList(),
+    );
+    return values;
+  }
+
+  static Future<List<AvatarItem>> cachedAvatars() async =>
+      (await _cachedCatalog(_avatarCacheKey)).map(AvatarItem.fromJson).toList();
+
+  static Future<List<PersonaItem>> cachedPersonas() async =>
+      (await _cachedCatalog(
+        _personaCacheKey,
+      )).map(PersonaItem.fromJson).toList();
+
+  static String get _avatarCacheKey =>
+      'public_avatars_${BackendIdentity.scope}';
+  static String get _personaCacheKey =>
+      'public_personas_${BackendIdentity.scope}';
+
+  static Future<void> _cacheCatalog(
+    String key,
+    List<Map<String, dynamic>> values,
+  ) async {
+    await (await SharedPreferences.getInstance()).setString(
+      key,
+      jsonEncode(values),
+    );
+  }
+
+  static Future<List<Map<String, dynamic>>> _cachedCatalog(String key) async {
+    final value = (await SharedPreferences.getInstance()).getString(key);
+    if (value == null) return const [];
+    try {
+      return (jsonDecode(value) as List).cast<Map<String, dynamic>>().toList();
+    } catch (_) {
+      return const [];
+    }
   }
 
   static String? _normalizeName(String? value) {
diff --git a/frontend/lib/shared/services/current_ledger_store.dart b/frontend/lib/shared/services/current_ledger_store.dart
index 73465e0..5404ed8 100644
--- a/frontend/lib/shared/services/current_ledger_store.dart
+++ b/frontend/lib/shared/services/current_ledger_store.dart
@@ -52,6 +52,17 @@ class CurrentLedgerStore extends ChangeNotifier {
     return _loading ??= _loadCached().whenComplete(() => _loading = null);
   }
 
+  Future<void> refreshRemote() async {
+    if (!SessionStore.instance.isAccount ||
+        SessionStore.instance.shouldUseLocalOnly) {
+      return;
+    }
+    final response = await _dio.get('/api/ledgers');
+    final values = response.data as List;
+    LocalDatabase.instance.cacheLedgers(values);
+    _apply(values);
+  }
+
   Future<void> _loadCached() async {
     _apply(LocalDatabase.instance.ledgers());
   }
@@ -78,11 +89,24 @@ class CurrentLedgerStore extends ChangeNotifier {
     final items = values
         .map((item) => LedgerInfo.fromJson(item as Map<String, dynamic>))
         .toList();
-    _ledgers = items;
-    _current =
+    final current =
         items.where((item) => item.isDefault).firstOrNull ??
         (items.isEmpty ? null : items.first);
-    notifyListeners();
+    final changed =
+        _current?.id != current?.id ||
+        _ledgers.length != items.length ||
+        Iterable<int>.generate(items.length).any((index) {
+          final before = _ledgers[index];
+          final after = items[index];
+          return before.id != after.id ||
+              before.name != after.name ||
+              before.iconKey != after.iconKey ||
+              before.isDefault != after.isDefault ||
+              before.transactionCount != after.transactionCount;
+        });
+    _ledgers = items;
+    _current = current;
+    if (changed) notifyListeners();
   }
 
   Future<void> select(int id) async {
diff --git a/frontend/lib/shared/widgets/backend_status_icon.dart b/frontend/lib/shared/widgets/backend_status_icon.dart
new file mode 100644
index 0000000..8829c10
--- /dev/null
+++ b/frontend/lib/shared/widgets/backend_status_icon.dart
@@ -0,0 +1,31 @@
+import 'package:flutter/material.dart';
+import 'package:miaoji_zhang/shared/api/api_client.dart';
+import 'package:miaoji_zhang/shared/theme/app_theme.dart';
+import 'package:miaoji_zhang/shared/widgets/app_icons.dart';
+
+class BackendStatusIcon extends StatelessWidget {
+  final Future<void> Function() onRetry;
+
+  const BackendStatusIcon({super.key, required this.onRetry});
+
+  @override
+  Widget build(BuildContext context) {
+    return ValueListenableBuilder<BackendAvailability>(
+      valueListenable: ApiClient.availability,
+      builder: (context, availability, _) {
+        if (availability != BackendAvailability.offline) {
+          return const SizedBox.shrink();
+        }
+        return IconButton(
+          tooltip: '当前显示本地数据，点击重试',
+          onPressed: onRetry,
+          icon: AppIcons.icon(
+            AppIcons.offline,
+            size: 18,
+            color: AppTheme.orange,
+          ),
+        );
+      },
+    );
+  }
+}
diff --git a/frontend/test/offline_local_first_test.dart b/frontend/test/offline_local_first_test.dart
new file mode 100644
index 0000000..fb1485b
--- /dev/null
+++ b/frontend/test/offline_local_first_test.dart
@@ -0,0 +1,149 @@
+import 'dart:io';
+
+import 'package:dio/dio.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:miaoji_zhang/shared/api/api_client.dart';
+import 'package:miaoji_zhang/shared/api/auth_api.dart';
+import 'package:miaoji_zhang/shared/widgets/backend_status_icon.dart';
+
+void main() {
+  tearDown(() {
+    ApiClient.availability.value = BackendAvailability.unknown;
+  });
+
+  testWidgets('离线状态只显示可点击且可访问的云朵重试图标', (tester) async {
+    var retries = 0;
+    ApiClient.availability.value = BackendAvailability.offline;
+
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(
+          appBar: AppBar(
+            actions: [
+              BackendStatusIcon(
+                onRetry: () async {
+                  retries++;
+                },
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+
+    final retry = find.byTooltip('当前显示本地数据，点击重试');
+    expect(retry, findsOneWidget);
+    await tester.tap(retry);
+    await tester.pump();
+    expect(retries, 1);
+
+    ApiClient.availability.value = BackendAvailability.online;
+    await tester.pump();
+    expect(retry, findsNothing);
+  });
+
+  test('连接、发送和接收失败都会被识别为后端不可达', () {
+    DioException failure(DioExceptionType type) => DioException(
+      requestOptions: RequestOptions(path: '/test'),
+      type: type,
+    );
+
+    expect(
+      isConnectivityError(failure(DioExceptionType.connectionError)),
+      isTrue,
+    );
+    expect(
+      isConnectivityError(failure(DioExceptionType.connectionTimeout)),
+      isTrue,
+    );
+    expect(isConnectivityError(failure(DioExceptionType.sendTimeout)), isTrue);
+    expect(
+      isConnectivityError(failure(DioExceptionType.receiveTimeout)),
+      isTrue,
+    );
+    expect(isConnectivityError(failure(DioExceptionType.badResponse)), isFalse);
+  });
+
+  test('AI 伙伴缓存 DTO 可无损往返', () {
+    final source = {
+      'avatarKey': 'cat',
+      'personaKey': 'gentle',
+      'customName': '小记',
+      'roastLevel': 20,
+      'stickerFrequency': 40,
+      'proactiveLevel': 60,
+    };
+    final companion = AiCompanion.fromJson(source);
+
+    expect(companion.toJson(), source);
+  });
+
+  test('七个页面保持本地首屏、后台刷新、竞态保护和统一离线入口', () {
+    final contracts = <String, List<String>>{
+      'lib/features/home/pages/home_page.dart': [
+        'monthLocal',
+        'monthRemote',
+        'BudgetApi.getLocal',
+        'BudgetApi.getRemote',
+        'refreshRemote',
+      ],
+      'lib/features/add/add_page.dart': [
+        "categoriesLocal('expense')",
+        "categoriesRemote('expense')",
+        "categoriesRemote('income')",
+      ],
+      'lib/features/stats/stats_page.dart': [
+        'periodStatsLocal',
+        'periodStatsRemote',
+      ],
+      'lib/features/stats/report_page.dart': [
+        'ReportApi.local',
+        'ReportApi.remote',
+      ],
+      'lib/features/settings/category_manage_page.dart': [
+        'categoriesLocal',
+        'categoriesRemote',
+      ],
+      'lib/features/settings/recycle_bin_page.dart': [
+        'recycleBinLocal',
+        'recycleBinRemote',
+      ],
+      'lib/features/settings/companion_page.dart': [
+        'cachedCompanion',
+        'cachedAvatars',
+        'cachedPersonas',
+        'forceRemote: true',
+      ],
+    };
+
+    for (final entry in contracts.entries) {
+      final source = File(entry.key).readAsStringSync();
+      expect(source, contains('_loadRevision'), reason: entry.key);
+      expect(source, contains('BackendStatusIcon'), reason: entry.key);
+      for (final token in entry.value) {
+        expect(source, contains(token), reason: '${entry.key}: $token');
+      }
+    }
+
+    final companion = File(
+      'lib/features/settings/companion_page.dart',
+    ).readAsStringSync();
+    expect(companion, isNot(contains('if (!_loaded)')));
+    expect(companion, contains('BackendAvailability.online'));
+  });
+
+  test('AI 缓存按后端和账号隔离，回收站破坏性操作只允许在线执行', () {
+    final auth = File('lib/shared/api/auth_api.dart').readAsStringSync();
+    final config = File('lib/shared/api/config_api.dart').readAsStringSync();
+    final recycle = File(
+      'lib/features/settings/recycle_bin_page.dart',
+    ).readAsStringSync();
+
+    expect(auth, contains("'ai_companion_\${BackendIdentity.scope}_\$userId'"));
+    expect(config, contains("'public_avatars_\${BackendIdentity.scope}'"));
+    expect(config, contains("'public_personas_\${BackendIdentity.scope}'"));
+    expect(recycle, contains('availability != BackendAvailability.online'));
+    expect(recycle, contains('if (online)'));
+  });
+}