结构大修改，改成朴实无华的结构，不过度架构。能跑就行

Assets/Scripts/Common/Net/MessageHandler/Chat2C_MessageHandler.cs

@@ -0,0 +1,23 @@
+using Fantasy;
+using Fantasy.Async;
+using Fantasy.Network;
+using Fantasy.Network.Interface;
+using NBC;
+using Log = NBC.Log;
+
+namespace NBF
+{
+    public class Chat2C_MessageHandler : Message<S2C_Message>
+    {
+        protected override async FTask Run(Session session, S2C_Message message)
+        {
+            Log.Info($"收到一条消息推送，message={message.Msg}");
+            var chatTestPanel = UI.Inst.GetUI<ChatTestPanel>();
+            if (chatTestPanel != null)
+            {
+                chatTestPanel.Message(message.Msg.Content);
+            }
+            await FTask.CompletedTask;
+        }
+    }
+}