前端：

1、更新界面图标
2、修改消息缓存逻辑
3、新增清空未读消息数
后端：
1、修复不同时区导致的时间显示问题
2、新增清空未读消息数接口

frontend/web/src/components/addMenu.vue

@@ -0,0 +1,180 @@
+<template>
+  <div class="add-menu-container" v-click-outside="closeMenu">
+    <button class="add-btn" :class="{ active: isShow }" @click="toggleMenu">
+      <span class="plus-icon">+</span>
+    </button>
+
+    <Transition name="pop">
+      <div v-if="isShow" class="menu-card">
+        <div class="arrow"></div>
+        
+        <div class="menu-list">
+          <div class="menu-item" v-for="(item, index) in props.menuList" :key="index" @click="handleAction(item.action)">
+            <i class="icon" v-html="item.icon"></i>
+            <span>{{item.text}}</span>
+        </div>
+      </div>
+      </div>
+    </Transition>
+  </div>
+</template>
+
+<script setup>
+import { ref, defineProps, onMounted, defineEmits } from 'vue';
+
+const props = defineProps({
+    menuList: {
+        type: Object,
+        required: true
+    }
+})
+
+const emit = defineEmits(['actionActive'])
+
+const isShow = ref(false);
+
+const toggleMenu = () => {
+  isShow.value = !isShow.value;
+};
+
+const closeMenu = () => {
+  isShow.value = false;
+};
+
+const handleAction = (type) => {
+    emit('actionActive', type);
+    isShow.value = false; // 点击后关闭
+  
+};
+
+/**
+ * 自定义指令：点击外部区域关闭菜单
+ * 也可以使用第三方库如 @vueuse/core 的 onClickOutside
+ */
+const vClickOutside = {
+  mounted(el, binding) {
+    el.clickOutsideEvent = (event) => {
+      if (!(el === event.target || el.contains(event.target))) {
+        binding.value();
+      }
+    };
+    document.addEventListener('click', el.clickOutsideEvent);
+  },
+  unmounted(el) {
+    document.removeEventListener('click', el.clickOutsideEvent);
+  },
+};
+</script>
+
+<style scoped>
+.add-menu-container {
+  position: relative;
+  display: inline-block;
+}
+
+/* 加号按钮样式 */
+.add-btn {
+  width: 32px;
+  height: 32px;
+  background: #dbdbdb;
+  border: none;
+  border-radius: 6px;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: all 0.2s;
+}
+
+.add-btn:hover {
+  background:  #cccbcb;
+}
+/*
+.add-btn.active {
+  background: #007aff;
+  color: white;
+}
+  */
+
+.plus-icon {
+  font-size: 22px;
+  line-height: 1;
+  font-weight: 300;
+}
+
+/* 弹出卡片容器 */
+.menu-card {
+  position: absolute;
+  top: 45px;
+  right: 0;
+  width: 100px;
+  background: white;
+  border-radius: 10px;
+  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
+  z-index: 100;
+  transform-origin: top right;
+}
+
+/* 小三角 */
+.arrow {
+  position: absolute;
+  top: -6px;
+  right: 12px;
+  width: 0;
+  height: 0;
+  border-left: 6px solid transparent;
+  border-right: 6px solid transparent;
+  border-bottom: 6px solid white;
+}
+
+/* 列表样式 */
+.menu-list {
+  padding: 6px 0;
+}
+
+.menu-item {
+  display: flex;
+  align-items: center;
+  padding: 5px 5px;
+  cursor: pointer;
+  transition: background 0.2s;
+  color: #333;
+}
+
+.menu-item:hover {
+  background: #f5f5f5;
+}
+
+.menu-item:first-child:hover {
+  border-top-left-radius: 10px;
+  border-top-right-radius: 10px;
+}
+
+.menu-item:last-child:hover {
+  border-bottom-left-radius: 10px;
+  border-bottom-right-radius: 10px;
+}
+
+.icon {
+  margin-right: 5px;
+  font-size: 12px;
+  display: flex;
+  align-items: center;
+  /*width: 20px;*/
+}
+
+.menu-item span {
+  font-size: 12px;
+  /*font-weight: 400;*/
+}
+
+/* 弹出动画 */
+.pop-enter-active, .pop-leave-active {
+  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
+}
+
+.pop-enter-from, .pop-leave-to {
+  opacity: 0;
+  transform: scale(0.9) translateY(-10px);
+}
+</style>

frontend/web/src/components/groups/GroupChatModal.vue

@@ -0,0 +1,256 @@
+<template>
+  <div class="modal-overlay" @click.self="$emit('close')">
+    <div class="chat-modal">
+      <div class="modal-header">
+        <div class="header-top">
+          <h3>群聊</h3>
+          <button class="close-btn" @click="$emit('close')">&times;</button>
+        </div>
+        <div class="search-bar">
+          <input 
+            v-model="searchQuery" 
+            type="text" 
+            placeholder="搜索群组..." 
+          />
+        </div>
+      </div>
+
+      <div class="chat-list">
+        <TransitionGroup name="list">
+          <div 
+            v-for="group in filteredGroups" 
+            :key="group.id" 
+            class="chat-item"
+            @click="handleSelect(group)"
+          >
+            <div 
+              class="avatar" 
+              :style="{ background: group.avatar ? `url(${group.avatar}) center/cover` : group.color }"
+            >
+              {{ group.avatar ? '' : group.name.charAt(0) }}
+            </div>
+
+            <div class="chat-info">
+              <div class="chat-name">{{ group.name }}</div>
+              <!--<div class="chat-preview">{{ group.lastMsg }}</div>-->
+            </div>
+            <!--
+            <div class="chat-meta">
+              <span class="time">{{ group.time }}</span>
+              <span v-if="group.unread" class="unread">{{ group.unread }}</span>
+            </div>
+            -->
+          </div>
+        
+        </TransitionGroup>
+
+        <div v-if="filteredGroups.length === 0" class="empty-state">
+          未找到相关群聊
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { ref, computed, defineProps } from 'vue';
+
+// 检查你的代码，确保 default 是一个返回数组的函数，且逗号、括号一一对应
+const props = defineProps({
+  initialGroups: {
+    type: Array,
+    default: () => [
+      { id: 1, name: '产品设计交流群', lastMsg: '张三: 确认一下原型图', time: '14:30', unread: 3, color: 'linear-gradient(45deg, #007AFF, #5AC8FA)' },
+      { id: 2, name: '技术研发部', lastMsg: '王五: Bug已修复并上线', time: '12:05', unread: 0, color: 'linear-gradient(45deg, #4CD964, #5AC8FA)' },
+      { id: 3, name: '周末户外徒步', lastMsg: '李四: 记得带雨伞', time: '昨天', unread: 12, color: 'linear-gradient(45deg, #FF9500, #FFCC00)' },
+      { id: 4, name: 'Family 家族群', lastMsg: '[图片]', time: '周一', unread: 0, color: 'linear-gradient(45deg, #5856D6, #AF52DE)' }, // 确保这里没有多余或缺失的逗号
+      { id: 5, name: 'Family 家族群', lastMsg: '[图片]', time: '周一', unread: 0, color: 'linear-gradient(45deg, #5856D6, #AF52DE)' },
+      { id: 6, name: 'Family 家族群', lastMsg: '[图片]', time: '周一', unread: 0, color: 'linear-gradient(45deg, #5856D6, #AF52DE)' },
+      { id: 7, name: 'Family 家族群', lastMsg: '[图片]', time: '周一', unread: 0, color: 'linear-gradient(45deg, #5856D6, #AF52DE)' },
+      { id: 8, name: 'Family 家族群', lastMsg: '[图片]', time: '周一', unread: 0, color: 'linear-gradient(45deg, #5856D6, #AF52DE)' },
+      { id: 9, name: 'Family 家族群', lastMsg: '[图片]', time: '周一', unread: 0, color: 'linear-gradient(45deg, #5856D6, #AF52DE)' }
+    ]
+  }
+}); // 检查这里是否漏掉了右括号 )
+
+
+const emit = defineEmits(['close', 'select']);
+const searchQuery = ref('');
+
+// 搜索过滤逻辑
+const filteredGroups = computed(() => {
+  return props.initialGroups.filter(g => 
+    g.name.toLowerCase().includes(searchQuery.value.toLowerCase())
+  );
+});
+
+const handleSelect = (group) => {
+  emit('select', group);
+};
+</script>
+
+<style scoped>
+/* 遮罩层 */
+.modal-overlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  background: rgba(0, 0, 0, 0.2);
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  backdrop-filter: blur(4px);
+  z-index: 1000;
+}
+
+/* 弹出层主容器 */
+.chat-modal {
+  width: 360px;
+  max-height: 80vh;
+  background: rgba(255, 255, 255, 0.9);
+  backdrop-filter: blur(20px);
+  border-radius: 28px;
+  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+  border: 1px solid rgba(255, 255, 255, 0.4);
+}
+
+/* 头部样式 */
+.modal-header {
+  padding: 20px 20px 10px;
+}
+
+.header-top {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-bottom: 15px;
+}
+
+.header-top h3 {
+  margin: 0;
+  font-size: 20px;
+  color: #1d1d1f;
+}
+
+.close-btn {
+  background: #eee;
+  border: none;
+  width: 28px;
+  height: 28px;
+  border-radius: 50%;
+  cursor: pointer;
+  font-size: 18px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+/* 搜索框 */
+.search-bar input {
+  width: 100%;
+  padding: 10px 15px;
+  border-radius: 12px;
+  border: none;
+  background: rgba(0, 0, 0, 0.05);
+  outline: none;
+  box-sizing: border-box;
+  font-size: 14px;
+}
+
+/* 列表滚动区 */
+.chat-list {
+  flex: 1;
+  overflow-y: auto;
+  padding: 10px;
+}
+
+.chat-item {
+  display: flex;
+  align-items: center;
+  padding: 12px;
+  border-radius: 18px;
+  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+  cursor: pointer;
+  margin-bottom: 4px;
+}
+
+.chat-item:hover {
+  background: rgba(0, 122, 255, 0.08);
+}
+
+/* 头像 */
+.avatar {
+  width: 50px;
+  height: 50px;
+  border-radius: 15px;
+  margin-right: 14px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  color: white;
+  font-weight: 600;
+  flex-shrink: 0;
+}
+
+.chat-info {
+  flex: 1;
+  min-width: 0;
+}
+
+.chat-name {
+  font-weight: 600;
+  font-size: 16px;
+  color: #1d1d1f;
+  margin-bottom: 4px;
+}
+
+.chat-preview {
+  font-size: 13px;
+  color: #86868b;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.chat-meta {
+  text-align: right;
+  margin-left: 10px;
+}
+
+.time {
+  font-size: 12px;
+  color: #86868b;
+  display: block;
+  margin-bottom: 5px;
+}
+
+.unread {
+  background: #007AFF;
+  color: white;
+  font-size: 11px;
+  padding: 2px 7px;
+  border-radius: 10px;
+  font-weight: 500;
+}
+
+/* 列表过渡动画 */
+.list-enter-active, .list-leave-active {
+  transition: all 0.3s ease;
+}
+.list-enter-from, .list-leave-to {
+  opacity: 0;
+  transform: translateX(-10px);
+}
+
+.empty-state {
+  text-align: center;
+  padding: 40px 0;
+  color: #86868b;
+  font-size: 14px;
+}
+</style>