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-CP3A-Editor直开入口补审基线.json

@@ -0,0 +1,31 @@
+{
+  "date": "2026-09-29",
+  "scope": "CP3A Editor direct-entry supplement",
+  "items": [
+    {
+      "path": "CodexOutput/upserver/B3BatchMigration/M2/M2-CP3A-Editor直开入口最小补审-2026-09-29.md",
+      "bytes": 2289,
+      "sha256": "BDE7D68BB73E9F9DD37ADEF3D18A88E521B73A14B94E78B1B0CC5494C3678B8D"
+    },
+    {
+      "path": "Client/Assets/Scripts/Stages/LoginStageCtx.cs",
+      "bytes": 632,
+      "sha256": "BFA21EBAB035321139C5CCAA99809191573A21D33958C36003524937CB2BAEF2"
+    },
+    {
+      "path": "Client/Assets/Scripts/Stages/FishingStageCtx.cs",
+      "bytes": 558,
+      "sha256": "F7344E0735823555701FBAF8A266950B4AFFE962541C83D468B3422AFE0A07A9"
+    },
+    {
+      "path": "Client/Assets/Scripts/SubBoostrap.cs",
+      "bytes": 19045,
+      "sha256": "99CCA08C84711DDAD0F9C5C36BFF3F6AF02ADC216E3ACD3FE8D704FE68DA8899"
+    },
+    {
+      "path": "Client/Assets/Scripts/Services/ClubService.cs",
+      "bytes": 47152,
+      "sha256": "CF418E56B3EE6CFD5AE9B4BF5AE39FFFEB0FD8B4AE454CE2E8C6E81DD4C4FD02"
+    }
+  ]
+}