fix(日志): 修复服务器类型日志显示问题

将日志中的服务器类型显示从字符串形式改为直接使用枚举值，避免不必要的ToString()调用

Author: AlianBlank

GameFrameX.Launcher/StartUp/Discovery/AppStartUpDiscoveryCenter.cs

@@ -96,7 +96,7 @@ private async void SendMessage(IAppSession session, INetworkMessage message)
             if (Setting.IsDebugSendHeartBeat || messageObjectHeader.OperationType != (byte)MessageOperationType.HeartBeat)
             {
                 var serverInfo = _namingServiceManager.GetNodeBySessionId(session.SessionID);
-                var toServerType = serverInfo != null ? serverInfo.Type.ToString() : ServerType.ToString();
+                var toServerType = serverInfo != null ? serverInfo.Type : ServerType;
                 LogHelper.Debug($"---发送[{ServerType} To {toServerType}]  {innerNetworkMessage.ToFormatMessageString()}");
             }
         }