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/Hotfix/Handler/G2C_RepeatLoginHandler.cs

@@ -0,0 +1,17 @@
+using Fantasy;
+using Fantasy.Async;
+using Fantasy.Network;
+using Fantasy.Network.Interface;
+using Log = NBC.Log;
+
+namespace Assets.Scripts.Hotfix
+{
+    public sealed class G2C_RepeatLoginHandler : Message<G2C_RepeatLogin>
+    {
+        protected override async FTask Run(Session session, G2C_RepeatLogin message)
+        {
+            Log.Info("客户端重复登录了");
+            await FTask.CompletedTask;
+        }
+    }
+}

Assets/Scripts/Common/Net/Hotfix/Handler/G2C_RepeatLoginHandler.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: a7624fabae6664a6c9c9ebccebba4450
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: