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-C3c正式互加好友实测-final-2026-09-30.json

@@ -0,0 +1,200 @@
+{
+  "time": "2026-09-30T15:36:25.7459551+08:00",
+  "api": "http://s101.local:18080/",
+  "accounts": [
+    "101",
+    "102"
+  ],
+  "requests": [
+    {
+      "account": "101",
+      "route": "account/Login",
+      "mutation": false,
+      "http": 200,
+      "code": null,
+      "error": null
+    },
+    {
+      "account": "101",
+      "route": "playerdata/Get",
+      "mutation": false,
+      "http": 200,
+      "code": null,
+      "error": null
+    },
+    {
+      "account": "101",
+      "route": "friend/GetFriendsList",
+      "mutation": false,
+      "http": 200,
+      "code": 1,
+      "error": null
+    },
+    {
+      "account": "102",
+      "route": "account/Login",
+      "mutation": false,
+      "http": 200,
+      "code": null,
+      "error": null
+    },
+    {
+      "account": "102",
+      "route": "playerdata/Get",
+      "mutation": false,
+      "http": 200,
+      "code": null,
+      "error": null
+    },
+    {
+      "account": "102",
+      "route": "friend/GetFriendsList",
+      "mutation": false,
+      "http": 200,
+      "code": 1,
+      "error": null
+    },
+    {
+      "account": "101",
+      "route": "friend/AddFriend",
+      "mutation": true,
+      "http": 200,
+      "code": 1,
+      "error": null
+    },
+    {
+      "account": "101",
+      "route": "friend/GetFriendsList",
+      "mutation": false,
+      "http": 200,
+      "code": 1,
+      "error": null
+    },
+    {
+      "account": "102",
+      "route": "friend/GetFriendsList",
+      "mutation": false,
+      "http": 200,
+      "code": 1,
+      "error": null
+    },
+    {
+      "account": "102",
+      "route": "friend/AcceptFriend",
+      "mutation": true,
+      "http": 200,
+      "code": 1,
+      "error": null
+    },
+    {
+      "account": "101",
+      "route": "friend/GetFriendsList",
+      "mutation": false,
+      "http": 200,
+      "code": 1,
+      "error": null
+    },
+    {
+      "account": "102",
+      "route": "friend/GetFriendsList",
+      "mutation": false,
+      "http": 200,
+      "code": 1,
+      "error": null
+    }
+  ],
+  "kvInputs": [
+    {
+      "displayNamePresent": false,
+      "avatarPresent": false,
+      "lastLoginTimeUtc": null,
+      "buildingPresent": false,
+      "account": "101",
+      "level": 62,
+      "levelSource": "NewPlayerDataDic.newData[0]"
+    },
+    {
+      "displayNamePresent": false,
+      "avatarPresent": false,
+      "lastLoginTimeUtc": null,
+      "buildingPresent": false,
+      "account": "102",
+      "level": 60,
+      "levelSource": "NewPlayerDataDic.newData[0]"
+    }
+  ],
+  "before": {
+    "101": {
+      "code": 1,
+      "count": 0,
+      "items": []
+    },
+    "102": {
+      "code": 1,
+      "count": 0,
+      "items": []
+    }
+  },
+  "after": {
+    "101": {
+      "code": 1,
+      "count": 1,
+      "items": [
+        {
+          "id": "102",
+          "encodedAsString": true,
+          "fields": [
+            {
+              "name": "PlayFabId",
+              "type": "String"
+            },
+            {
+              "name": "DisplayName",
+              "type": "String"
+            },
+            {
+              "name": "AvatarUrl",
+              "type": "String"
+            },
+            {
+              "name": "Level",
+              "type": "Int64",
+              "value": 1
+            }
+          ]
+        }
+      ]
+    },
+    "102": {
+      "code": 1,
+      "count": 1,
+      "items": [
+        {
+          "id": "101",
+          "encodedAsString": true,
+          "fields": [
+            {
+              "name": "PlayFabId",
+              "type": "String"
+            },
+            {
+              "name": "DisplayName",
+              "type": "String"
+            },
+            {
+              "name": "AvatarUrl",
+              "type": "String"
+            },
+            {
+              "name": "Level",
+              "type": "Int64",
+              "value": 1
+            }
+          ]
+        }
+      ]
+    }
+  },
+  "error": null,
+  "mutual": true
+}