Migrate frontend realtime messaging to SSE.

Switch service integrations and screen/store consumers from websocket events to SSE, and ignore generated dist-web artifacts.

Made-with: Cursor

src/services/messageService.ts

@@ -441,6 +441,16 @@ class MessageService {
     });
   }
 
+  /**
+   * 上报输入状态
+   * POST /api/v1/conversations/typing
+   */
+  async sendTyping(conversationId: string): Promise<void> {
+    await api.post('/conversations/typing', {
+      conversation_id: conversationId,
+    });
+  }
+
   /**
    * 获取未读总数
    * GET /api/v1/conversations/unread/count