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。

CodexOutput/upserver/B3BatchMigration/M2/M2-合批-C2c-旧消耗首败结果.json

@@ -0,0 +1,15 @@
+{
+  "Success": true,
+  "Result": "FAILED: System.NullReferenceException: Object reference not set to an instance of an object\r\n  at MiniBattlePassDataProvider.GetMiniBattlePassRecord (System.String key) [0x00001] in C:\\projects\\ft\\Client\\Assets\\Scripts\\MiniBP\\MiniBattlePassDataProvider.cs:143 \r\n  at game.PlayerDataStorage.PlayerKVGameplayLoop+FishingSubscribers.Bind (cfg.Tables tables, GameCore.FishingEventData events, asap.core.Container container) [0x002ee] in C:\\projects\\ft\\Client\\Assets\\Scripts\\Services\\UserService.KVFishingValidation.cs:300 \r\n  at game.PlayerDataStorage.PlayerKVGameplayLoop.VerifyFishingForEditorAsync () [0x022c2] in C:\\projects\\ft\\Client\\Assets\\Scripts\\Services\\UserService.KVFishingValidation.cs:199 \r\n  at game.PlayerDataStorage.PlayerKVGameplayLoop.VerifyFishingForEditorAsync () [0x02f38] in C:\\projects\\ft\\Client\\Assets\\Scripts\\Services\\UserService.KVFishingValidation.cs:263 \r\n  at KVGameplayLoopSetup.RunValidationAsync (System.String caseId) [0x00101] in C:\\projects\\ft\\Client\\Assets\\Editor\\KVGameplayLoopSetup.cs:27 \r\n  at uLoopMCP.Dynamic.DynamicCommand.ExecuteAsync (System.Collections.Generic.Dictionary`2[TKey,TValue] parameters, System.Threading.CancellationToken ct) [0x000b7] in <8dca5bd1d8bf43df93261731dab4e187>:0 ",
+  "Logs": [
+    "Execution completed successfully",
+    "Performance hint: Auto-resolved 1 missing using directive(s): using UnityEngine.Rendering.VirtualTexturing; — Include them in your code to skip auto-resolution and improve compilation speed."
+  ],
+  "CompilationErrors": [],
+  "ErrorMessage": "",
+  "SecurityLevel": "Restricted",
+  "Error": "",
+  "UpdatedCode": null,
+  "DiagnosticsSummary": null,
+  "Diagnostics": []
+}