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/EventBingo/EventBingoData.cs

@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
 using GameCore;
 using System;
@@ -410,6 +410,8 @@ public class EventBingoStepState
 
 public class EventBingoPlayfabData
 {
+    readonly game.PlayerDataStorage.IPlayerSaveStore saveStore = GContext.container.Resolve<game.PlayerDataStorage.IPlayerSaveStore>();
+
     public int EventId, TicketCount, RoundCount, StepInRound, Seed, ChainProgress, ChainTaskTokenProgress;
     public float InflationRate;
     private const int TokenCount = 8;
@@ -473,12 +475,12 @@ public class EventBingoPlayfabData
 
     public void Save()
     {
-        PlayFabMgr.Instance.UpdateUserDataValue(Key, Serialize());
+        saveStore.Write(Key, Serialize()).RequireAccepted();
     }
 
     public static EventBingoPlayfabData Load()
     {
-        var s = PlayFabMgr.Instance.GetLocalData(Key);
+        var s = GContext.container.Resolve<game.PlayerDataStorage.IPlayerSaveStore>().Read(Key).ValueOrThrow();
         return Deserialize(s);
     }
 }