ModelTranslator: 菜单转换取消时用 taskkill 杀进程树，python -u 实时输出

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

Client/Assets/Editor/ModelTranslatorMenu.cs

@@ -60,6 +60,8 @@ namespace XGame.Editor
         {
             EditorApplication.update -= OnUpdate;
             SavePrefs();
+            if (_proc != null)
+                UnityEngine.Debug.LogWarning("[模型转换] 窗口关闭或脚本重编译中止了正在进行的转换");
             KillProc();
         }
 
@@ -177,7 +179,7 @@ namespace XGame.Editor
             {
                 FileName = _pythonPath,
                 Arguments = string.Format(
-                    "\"{0}\" \"{1}\" -o \"{2}\" --max-size {3} --blender \"{4}\"",
+                    "-u \"{0}\" \"{1}\" -o \"{2}\" --max-size {3} --blender \"{4}\"",
                     script, _fbxPath, Path.Combine(RepoRoot, outRel), _maxSize, _blenderPath),
                 WorkingDirectory = RepoRoot,
                 UseShellExecute = false,
@@ -267,10 +269,17 @@ namespace XGame.Editor
         private void KillProc()
         {
             if (_proc == null) return;
-            try { if (!_proc.HasExited) _proc.Kill(); }
+            try
+            {
+                // 用 taskkill /T 连 blender 子进程一起杀（Mono BCL 无 Kill(tree) 重载）
+                if (!_proc.HasExited)
+                    Process.Start(new ProcessStartInfo("taskkill", "/PID " + _proc.Id + " /T /F")
+                        { UseShellExecute = false, CreateNoWindow = true });
+            }
             catch { /* 进程可能刚好退出 */ }
             _proc.Dispose();
             _proc = null;
+            lock (_lock) _pending.Clear(); // 丢弃残留输出，避免插在 [已取消] 之后
         }
     }
 }