feat: isolate lobby during minigames

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Client/Assets/Script/xmain/MiniGame/MiniGameHost.cs

@@ -69,12 +69,19 @@ namespace XGame.MiniGame
             var dl = new MiniGameDownloader(cdnBase, gameId, version);
             bool ok = false;
             yield return dl.Run(r => ok = r);
-            if (!ok) { Debug.LogError("[MiniGameHost] 下载失败: " + dl.Error); yield break; }
+            if (!ok)
+            {
+                FailEnterAndExit("下载失败: " + dl.Error);
+                yield break;
+            }
 
             // 2) 加载 Core/Client DLL，反射入口
             var asmLoader = new MiniGameAssemblyLoader();
             if (!asmLoader.Load(dl.LocalDir, dl.Manifest))
-            { Debug.LogError("[MiniGameHost] 加载程序集失败: " + asmLoader.Error); yield break; }
+            {
+                FailEnterAndExit("加载程序集失败: " + asmLoader.Error);
+                yield break;
+            }
 
             // 3) 网络通道
             _net = new MiniGameNetChannel(sock);
@@ -82,7 +89,16 @@ namespace XGame.MiniGame
             _net.OnFrameworkFrame = OnFrameworkFrame;
 
             // 4) 反射实例化 IGameClient + 注入 ctx
-            _client = asmLoader.CreateClient();
+            try
+            {
+                _client = asmLoader.CreateClient();
+            }
+            catch (Exception e)
+            {
+                FailEnterAndExit("创建客户端失败: " + e.Message);
+                yield break;
+            }
+
             _assets = new MiniGameAssetLoader(dl.LocalDir, dl.Manifest);
             if (_players == null)
             {
@@ -103,7 +119,15 @@ namespace XGame.MiniGame
 
             // 6) OnEnter 接管
             // 注意：OnEnter 在 MatchFound 到达之前调用，房间可能尚未就绪；小游戏应等待后续网络消息再依赖房间状态
-            SafeCall(() => _client.OnEnter(_ctx), "OnEnter");
+            try
+            {
+                _client.OnEnter(_ctx);
+            }
+            catch (Exception e)
+            {
+                FailEnterAndExit("OnEnter 抛异常: " + e.Message);
+                yield break;
+            }
             _running = true;
             Debug.Log("[MiniGameHost] 小游戏已进入: " + gameId);
         }
@@ -157,6 +181,27 @@ namespace XGame.MiniGame
             // 返回大厅：交回 Lua game_module_runner 或大厅 UI（按现有大厅返回流程）
         }
 
+        private void FailEnterAndExit(string reason)
+        {
+            DestroyResultDialog();
+            _waitingForResultConfirm = false;
+            _running = false;
+            _client = null;
+            _net = null;
+            _ctx = null;
+            if (_players != null)
+            {
+                _players.SetRoomPlayers(null);
+            }
+            if (_assets != null)
+            {
+                _assets.UnloadAll();
+                _assets = null;
+            }
+            Debug.LogError("[MiniGameHost] 进入小游戏失败: " + reason);
+            OnGameExited?.Invoke();
+        }
+
         private void ShowResultDialog(RoomEndMsg roomEnd)
         {
             if (_waitingForResultConfirm)