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/OfferTreasureAscent/OfferTreasureAscentManager.cs

@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using GameCore;
 using System.Linq;
 using asap.core;
@@ -11,6 +11,8 @@ namespace OfferTreasureAscent
 {
     public class Manager
     {
+    readonly game.PlayerDataStorage.IPlayerSaveStore saveStore = GContext.container.Resolve<game.PlayerDataStorage.IPlayerSaveStore>();
+
         private int _status = 0, _eventId, _redirectId;
         private List<int> _failedPurchaseRewardIndices;
         private PlayerItemData _playerItemData => GContext.container.Resolve<PlayerItemData>();
@@ -78,14 +80,14 @@ namespace OfferTreasureAscent
             if (_failedPurchaseRewardIndices != null && _failedPurchaseRewardIndices.Count > 0)
                 foreach (var i in _failedPurchaseRewardIndices)
                     sb.AppendFormat("{0},", i);
-            PlayFabMgr.Instance.UpdateUserDataValue(PfKey, sb.ToString());
+            saveStore.Write(PfKey, sb.ToString()).RequireAccepted();
         }
 
         public bool Load()
         {
             try
             {
-                var s = PlayFabMgr.Instance.GetLocalData(PfKey);
+                var s = saveStore.Read(PfKey).ValueOrThrow();
                 if (s == null || s == "")
                     return false;
                 var tokens = s.Trim(',').Split(',');