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集中边界差异hash.json

@@ -0,0 +1,25 @@
+{
+  "date": "2026-09-29T22:16:56.973056+08:00",
+  "status": "scope-extension-awaiting-review",
+  "reason": "真实补单await与既有离线验证装配，未修改三个增量文件",
+  "items": [
+    {
+      "path": "Client/Assets/Scripts/UI/Home/HomePanel.cs",
+      "bytes": 62229,
+      "sha256": "3F863C8863FDD4B4CB27638D1EB9D2E29CF024C8D39A39185D097BBDB74F5AF3",
+      "unchangedFromFormalBaseline": true
+    },
+    {
+      "path": "Client/Assets/Scripts/Services/UserService.KVFishingRewardValidation.cs",
+      "bytes": 53687,
+      "sha256": "34C32F02597DB7A1877BB1B87B73EC1F6E368360EBBAA080D6B0B2577799E825",
+      "unchangedFromFormalBaseline": true
+    },
+    {
+      "path": "Client/Assets/Scripts/Services/UserService.KVFishingValidation.cs",
+      "bytes": 27350,
+      "sha256": "047075726C3C83CA76C0DCCD1C9A4186236F457BFD294164B6066EC5ABEF06BF",
+      "unchangedFromFormalBaseline": true
+    }
+  ]
+}