Add domestic vendor push infrastructure

frontend/lib/app/app.dart

@@ -18,6 +18,7 @@ import 'package:miaoji_zhang/features/settings/budget_page.dart';
 import 'package:miaoji_zhang/features/settings/category_manage_page.dart';
 import 'package:miaoji_zhang/features/settings/companion_page.dart';
 import 'package:miaoji_zhang/features/settings/me_page.dart';
+import 'package:miaoji_zhang/features/settings/push_settings_page.dart';
 import 'package:miaoji_zhang/features/settings/recycle_bin_page.dart';
 import 'package:miaoji_zhang/features/settings/recognition_batch_page.dart';
 import 'package:miaoji_zhang/features/settings/legal_document_page.dart';
@@ -34,6 +35,7 @@ import 'package:miaoji_zhang/shared/services/recognition_import_service.dart';
 import 'package:miaoji_zhang/shared/services/screenshot_channel.dart';
 import 'package:miaoji_zhang/shared/services/sync_service.dart';
 import 'package:miaoji_zhang/shared/services/session_store.dart';
+import 'package:miaoji_zhang/shared/services/push_service.dart';
 import 'package:miaoji_zhang/shared/theme/theme_store.dart';
 import 'package:miaoji_zhang/shared/update/update_coordinator.dart';
 import 'package:provider/provider.dart';
@@ -70,6 +72,10 @@ final router = GoRouter(
     GoRoute(path: '/budget', builder: (_, __) => const BudgetPage()),
     GoRoute(path: '/account-data', builder: (_, __) => const AccountDataPage()),
     GoRoute(path: '/appearance', builder: (_, __) => const AppearancePage()),
+    GoRoute(
+      path: '/notification-settings',
+      builder: (_, __) => const PushSettingsPage(),
+    ),
     GoRoute(path: '/recycle-bin', builder: (_, __) => const RecycleBinPage()),
     GoRoute(
       path: '/sync-conflicts',
@@ -147,6 +153,7 @@ class _MiaoJiAppState extends State<MiaoJiApp> with WidgetsBindingObserver {
       onError: _handleScreenshotError,
     );
     ScreenshotChannel.onRecognitionAction(_handleRecognitionAction);
+    PushService.instance.setOpenHandler(_handlePushOpen);
   }
 
   @override
@@ -170,6 +177,7 @@ class _MiaoJiAppState extends State<MiaoJiApp> with WidgetsBindingObserver {
     }
     await _runSafely(RecognitionImportService.configureNativeContext);
     await _runSafely(RecognitionImportService.importAutomatic);
+    await _runSafely(PushService.instance.initialize);
     if (mounted) setState(() {});
     unawaited(_refreshRemoteState());
   }
@@ -177,6 +185,7 @@ class _MiaoJiAppState extends State<MiaoJiApp> with WidgetsBindingObserver {
   Future<void> _resumeServices() async {
     await _runSafely(RecognitionImportService.configureNativeContext);
     await _runSafely(RecognitionImportService.importAutomatic);
+    await _runSafely(PushService.instance.refresh);
     unawaited(_refreshRemoteState());
   }
 
@@ -213,6 +222,26 @@ class _MiaoJiAppState extends State<MiaoJiApp> with WidgetsBindingObserver {
     await RecognitionImportService.handleAction(context, action);
   }
 
+  Future<void> _handlePushOpen(PushOpen open) async {
+    await Future<void>.delayed(const Duration(milliseconds: 150));
+    final context = _rootNavigatorKey.currentContext;
+    if (!mounted || context == null || !context.mounted) return;
+    if (!SessionStore.instance.isAccount && open.action == 'budget') {
+      router.go('/login', extra: null);
+      return;
+    }
+    switch (open.action) {
+      case 'home':
+        router.go('/home');
+      case 'budget':
+        router.push('/budget');
+      case 'update':
+        await UpdateCoordinator.instance.checkManually(context);
+      case 'none':
+        break;
+    }
+  }
+
   void _handleSessionExpired() {
     final context = _rootNavigatorKey.currentContext;
     if (context != null && context.mounted) {