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-CP2A-Player编译阻断受审基线.json

@@ -0,0 +1,26 @@
+{
+  "date": "2026-09-29",
+  "scope": "M2 CP2A Player compile blocker supplementary independent design review; no code approval",
+  "items": [
+    {
+      "path": "Client/Assets/Scripts/DataCenter/FishingChallengeManager.cs",
+      "length": 37862,
+      "sha256": "C03389252134497CC286440A938F893B8A8E2470EC3527A5DB35FE87ACA00666"
+    },
+    {
+      "path": "CodexOutput/upserver/B3BatchMigration/M2/M2-CP2A-Player编译阻断补审方案-待独立审查.md",
+      "length": 2228,
+      "sha256": "90483B8BCB60B5D3131380DCB8AE6BCB7B2D102CFA78F4049235235F157BF5BD"
+    },
+    {
+      "path": "CodexOutput/upserver/B3BatchMigration/M2/M2-CP2A独立方案审查主会话裁决与实施边界-2026-09-29.md",
+      "length": 7176,
+      "sha256": "4AED508D9BFEF397932093B8633FF3426B0A0681D04B60498AAC988D5E83D978"
+    },
+    {
+      "path": "CodexOutput/upserver/B3BatchMigration/M2/M2-CP2A-Editor编译核验.json",
+      "length": 234,
+      "sha256": "4A495AF1B10F822BF1ADE66BF711B0D3CF68A78F4AEBF422D0A4B17ACC7B8E04"
+    }
+  ]
+}