feat(upserver): 保存M2客户端KV迁移至本人统计写检查点

保存独立KV用户服务、固定会话存档与原业务接线，以及C3d资料缓存和C3e本人统计写。
保留原PF/AGG路线、业务公式和时序；榜单读取、好友资料、公告、匹配及首场景闸仍待完成。

验证：ServiceHost两条件各33组646断言；Unity CLI Loop编译0错误269警告。
包含相关方案、评审裁决、测试及状态文档。未操作服务器、正式账号或打包。

Client/Assets/Scripts/UI/Setting/SettingNotificationsPopupPanel.cs

@@ -7,19 +7,48 @@ public class SettingNotificationsPopupPanel : MonoBehaviour
 {
     public Button btn_ok;
     public Button btn_cancel;
+    ILocalNotificationService notifications;
+    bool handling;
+    bool completed;
     private void Start()
     {
+        notifications = GContext.container.Resolve<ILocalNotificationService>();
         btn_ok.onClick.AddListener(OnBtnOk);
         btn_cancel.onClick.AddListener(DestroyUI);
     }
-    private void OnBtnOk()
+    private async void OnBtnOk()
     {
-        DestroyUI();
-        ILocalNotificationService service = GContext.container.Resolve<ILocalNotificationService>();
-        service.OpenSettings();
+        if (this == null || handling || completed) return;
+        handling = true;
+        try
+        {
+            if (notifications is LocalNotificationService local && local.HasKVPromptOwner)
+            {
+                local.RequirePromptOwner();
+                await local.OpenSettingsAsync();
+                if (this == null) return;
+                local.RequirePromptOwner();
+            }
+            else
+            {
+                DestroyUI();
+                notifications.OpenSettings();
+                return;
+            }
+            DestroyUI();
+        }
+        catch (System.Exception ex) { game.DefaultSettingService.LogPromptFailure(ex); }
+        finally { handling = false; }
     }
     void DestroyUI()
     {
-        UIManager.Instance.DestroyUI(gameObject.name);
+        if (this == null || completed) return;
+        try
+        {
+            (notifications as LocalNotificationService)?.RequirePromptOwner();
+            completed = true;
+            UIManager.Instance.DestroyUI(gameObject.name);
+        }
+        catch (System.Exception ex) { game.DefaultSettingService.LogPromptFailure(ex); }
     }
 }