完善 SimpleLite 启停控制与服务状态页。

拆分 StopAll/Restart，运维代理透传确认头与用户信息，服务状态页可更稳地重启进程。

Co-authored-by: Cursor <cursoragent@cursor.com>

MiGu.Server/Launcher/SimpleLiteLauncher.cs

@@ -349,11 +349,10 @@ public sealed class SimpleLiteLauncher : IDisposable
     /// <summary>写 active-scenes.json 的结果（供向导保存接口回显）。</summary>
     public readonly record struct ActiveScenesWriteResult(bool Ok, string? Path, string? Error);
 
-    /// <summary>
-    /// 关闭所有 SimpleLite 进程、同步 obj→bin 最新 DLL，再按 launchMode 重新拉起。
-    /// </summary>
-    public LaunchResult RestartForUpdate(string launchMode = "webonly")
+    /// <summary>终止本机全部 SimpleLite 进程并清理 MiGu.Server 侧托管引用。</summary>
+    public int StopAll()
     {
+        var killed = 0;
         foreach (var proc in Process.GetProcessesByName("SimpleLite"))
         {
             try
@@ -361,12 +360,13 @@ public sealed class SimpleLiteLauncher : IDisposable
                 if (!proc.HasExited)
                 {
                     proc.Kill(entireProcessTree: true);
-                    _log.LogInformation("[SimpleLite] restart-for-update: killed pid={Pid}", proc.Id);
+                    killed++;
+                    _log.LogInformation("[SimpleLite] stop: killed pid={Pid}", proc.Id);
                 }
             }
             catch (Exception ex)
             {
-                _log.LogWarning("[SimpleLite] restart-for-update: kill pid={Pid} failed: {Msg}", proc.Id, ex.Message);
+                _log.LogWarning("[SimpleLite] stop: kill pid={Pid} failed: {Msg}", proc.Id, ex.Message);
             }
             finally
             {
@@ -374,7 +374,7 @@ public sealed class SimpleLiteLauncher : IDisposable
             }
         }
 
-        Thread.Sleep(1500);
+        if (killed > 0) Thread.Sleep(1500);
 
         lock (_sync)
         {
@@ -382,6 +382,23 @@ public sealed class SimpleLiteLauncher : IDisposable
             _lastLaunchMode = null;
         }
 
+        return killed;
+    }
+
+    /// <summary>关闭全部 SimpleLite 后按 launchMode 重新拉起（不同步 DLL）。</summary>
+    public LaunchResult Restart(string launchMode = "webonly")
+    {
+        StopAll();
+        return MaybeStart(launchMode);
+    }
+
+    /// <summary>
+    /// 关闭所有 SimpleLite 进程、同步 obj→bin 最新 DLL，再按 launchMode 重新拉起。
+    /// </summary>
+    public LaunchResult RestartForUpdate(string launchMode = "webonly")
+    {
+        StopAll();
+
         var synced = SimpleLiteBuildSync.TrySyncFromObjToBin(_env.ContentRootPath, _log);
         var result = MaybeStart(launchMode);
         if (!synced && result.Warning == null)