桌面通知（系统级消息提醒

frontend/src/features/chats/views/MessagesView.vue

@@ -5,6 +5,7 @@ import { ElMessage } from 'element-plus'
 import { ChatDotRound, Refresh, Tickets } from '@element-plus/icons-vue'
 import { fetchChats, type ChatConversation } from '@/features/chats/api/chats'
 import { useChatSSE, type ChatEvent } from '@/features/chats/composables/useChatSSE'
+import NotificationSettings from '@/features/chats/components/NotificationSettings.vue'
 import { formatDateMinute } from '@/utils/time'
 
 const router = useRouter()
@@ -69,6 +70,7 @@ function previewText(item: ChatConversation) {
         <p>{{ unreadTotal > 0 ? `${unreadTotal} 条未读` : '查看订单群聊和平台客服消息。' }}</p>
       </div>
       <div class="header-actions">
+        <NotificationSettings scope="user" />
         <el-button :icon="Refresh" :loading="loading" @click="loadChats(true)">刷新</el-button>
         <el-button type="primary" :icon="Tickets" @click="router.push('/orders')">我的订单</el-button>
       </div>