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/BindAccountPopupPanel.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Threading.Tasks;
 using asap.core;
 using cfg;
@@ -11,6 +11,8 @@ using UnityEngine.UI;
 
 public class BindAccountPopupPanel : MonoBehaviour
 {
+    game.PlayerDataStorage.IPlayerSaveStore saveStore;
+
     IUserService userService;
     Button btn_close;
     Button btn_close1;
@@ -27,6 +29,7 @@ public class BindAccountPopupPanel : MonoBehaviour
     ItemData itemData;
     private void Awake()
     {
+        saveStore = GContext.container.Resolve<game.PlayerDataStorage.IPlayerSaveStore>();
         userService = GContext.container.Resolve<IUserService>();
         btn_close1 = transform.Find("btn_close").GetComponent<Button>();
         btn_close = transform.Find("mask").GetComponent<Button>();
@@ -203,10 +206,11 @@ public class BindAccountPopupPanel : MonoBehaviour
         {
             UIManager.ShowWaitingBlock("BindAccountPopupPanel::OnlinkSns");
             var (code, userid) = await userService.LinkAccount(accountType);
+            if (this == null || !saveStore.IsCurrent) return false;
 
             if (code == 0)
             {
-                PlayFabMgr.Instance.UpdateUserDataValue(accountType.ToString(), "1");
+                saveStore.Write(accountType.ToString(), "1").RequireAccepted();
                 ToastPanel.Show(LocalizationMgr.GetText("UI_BindAccountPopupPanel_101007"));
             }
             else if (code == -1 && userid != int.Parse(userService.CustomId))
@@ -214,6 +218,7 @@ public class BindAccountPopupPanel : MonoBehaviour
                 var config = GContext.container.Resolve<IConfig>();
                 var titleId = config.Get<string>(GConstant.K_PlayFab_Title, GConstant.V_Debug_PF_Title);
                 var info = await PlayFabTools.GetPFPlayerInfoBySDKId(userid, titleId);
+                if (this == null || !saveStore.IsCurrent) return false;
                 if (!info.IsAccountValid || !info.IsDataValid)
                 {
                     Debug.LogWarning(
@@ -223,6 +228,7 @@ public class BindAccountPopupPanel : MonoBehaviour
                 }
 
                 var switchPanelGo = await UIManager.Instance.GetUIAsync(UITypes.AccountSwitchPopupPanel);
+                if (this == null || !saveStore.IsCurrent) return false;
                 switchPanelGo.GetComponent<AccountSwitchPopupPanel>()
                     .SetData(info.DisplayName, info.Avatar, info.Level, userid, accountType);
                 UIManager.Instance.DestroyUI(UITypes.BindAccountPopupPanel);