将join room提前到on_connect

Html/apps/static/js/chatbox.js

@@ -75,6 +75,8 @@ document.addEventListener('DOMContentLoaded', function () {
             folder: data.folder
         }
     });
+    console.log('Connecting to WebSocket server at wss://${host}/agent');
+    console.log(data);
 
     // 初始化聊天消息管理器
     chatManager = new ChatMessageManager();