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/SettingNotificationsGradePopupPanel.cs

@@ -8,19 +8,47 @@ public class SettingNotificationsGradePopupPanel : MonoBehaviour
 {
     public Button btn_ok;
     public Button btn_cancel;
+    ISettingService settings;
+    ILocalNotificationService notifications;
+    bool handling;
+    bool completed;
     private void Start()
     {
+        settings = GContext.container.Resolve<ISettingService>();
+        notifications = GContext.container.Resolve<ILocalNotificationService>();
         btn_ok.onClick.AddListener(OnBtnOk);
         btn_cancel.onClick.AddListener(DestroyUI);
     }
     private void OnBtnOk()
     {
-        DestroyUI();
-        GContext.container.Resolve<ILocalNotificationService>().OpenSettings();
+        HandlePrompt(true);
     }
     void DestroyUI()
     {
-        GContext.container.Resolve<ISettingService>().ShowNotice = true;
-        UIManager.Instance.DestroyUI(gameObject.name);
+        HandlePrompt(false);
+    }
+    async void HandlePrompt(bool openSettings)
+    {
+        if (this == null || handling || completed) return;
+        handling = true;
+        try
+        {
+            (settings as DefaultSettingService)?.RequirePromptOwner();
+            (notifications as LocalNotificationService)?.RequirePromptOwner(settings);
+            settings.ShowNotice = true;
+            if (openSettings && settings is DefaultSettingService bound && bound.HasKVPromptOwner)
+            {
+                await ((LocalNotificationService)notifications).OpenSettingsAsync();
+                if (this == null) return;
+                bound.RequirePromptOwner();
+            }
+            (settings as DefaultSettingService)?.RequirePromptOwner();
+            completed = true;
+            UIManager.Instance.DestroyUI(gameObject.name);
+            if (openSettings && !(settings is DefaultSettingService kv && kv.HasKVPromptOwner))
+                notifications.OpenSettings();
+        }
+        catch (System.Exception ex) { game.DefaultSettingService.LogPromptFailure(ex); }
+        finally { handling = false; }
     }
 }