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。

Client/Assets/Scripts/Services/SettingService.cs

@@ -3,6 +3,8 @@ using System.Threading.Tasks;
 using asap.core;
 using Game;
 using UnityEngine;
+using System;
+using game.PlayerDataStorage;
 
 namespace game
 {
@@ -27,6 +29,61 @@ namespace game
         int _unitOfWeight = 1;
         bool? _showNotice;
 
+        readonly bool requiresFormalKV;
+        PlayerKVGameSessionHandle promptOwner;
+        internal PlayerKVEditResult LastPromptEdit { get; private set; }
+        internal bool HasKVPromptOwner => promptOwner != null;
+
+        // Preserve only our key/owner/error metadata across void UI boundaries, never platform payloads.
+        internal static InvalidOperationException PromptFailure(string message)
+        {
+            var error = new InvalidOperationException(message);
+            error.Data["B01PromptDiagnostic"] = message;
+            return error;
+        }
+        internal static void LogPromptFailure(Exception error) => Debug.LogError(
+            error.Data["B01PromptDiagnostic"] as string ?? "Notification prompt stopped: " + error.GetType().Name);
+
+        public DefaultSettingService() : this(false) { }
+        internal DefaultSettingService(bool formalKV) { requiresFormalKV = formalKV; }
+        internal DefaultSettingService(PlayerKVGameSessionHandle owner) : this(true)
+        {
+            promptOwner = owner ?? throw new ArgumentNullException(nameof(owner));
+            RequirePromptOwner();
+        }
+
+        // The frozen startup selection is supplied before login; this instance can never change owners.
+        internal void PreflightFormalPromptOwner(PlayerKVGameSessionHandle owner)
+        {
+            if (!requiresFormalKV || owner == null || (promptOwner != null && !ReferenceEquals(promptOwner, owner)))
+                throw PromptFailure("ShowNotice: formal owner mismatch.");
+            var read = KVMgr.ReadKV(owner, "ShowNotice");
+            if (!read.Success) throw PromptFailure($"ShowNotice owner={owner.OwnerInstanceId}: {read.Error}");
+        }
+        internal void BindFormalPromptOwner(PlayerKVGameSessionHandle owner)
+        {
+            PreflightFormalPromptOwner(owner);
+            if (promptOwner == null) promptOwner = owner;
+            RequirePromptOwner();
+        }
+        internal bool HasFormalPromptOwner(PlayerKVGameSessionHandle owner) =>
+            requiresFormalKV && ReferenceEquals(promptOwner, owner);
+        internal void RequirePromptOwner()
+        {
+            if (promptOwner != null) ReadPrompt();
+            else if (requiresFormalKV) throw PromptFailure("ShowNotice: formal owner not handed off.");
+        }
+
+        PlayerKVKeyReadResult ReadPrompt()
+        {
+            if (LastPromptEdit != null && !LastPromptEdit.Accepted)
+                throw PromptFailure($"ShowNotice owner={promptOwner.OwnerInstanceId}: {LastPromptEdit.StateResult.Error}; uncertain={LastPromptEdit.StateResult.LocalCommitMayHaveSucceeded}");
+            var read = KVMgr.ReadKV(promptOwner, "ShowNotice");
+            if (!read.Success)
+                throw PromptFailure($"ShowNotice owner={promptOwner.OwnerInstanceId}: {read.Error}");
+            return read;
+        }
+
         public bool Music
         {
             set
@@ -105,11 +162,33 @@ namespace game
         {
             get
             {
+                if (requiresFormalKV && promptOwner == null) RequirePromptOwner();
+                if (promptOwner != null)
+                {
+                    var read = ReadPrompt();
+                    _showNotice = read.Found == true && read.Value == "1";
+                    return _showNotice.Value;
+                }
                 _showNotice ??= PlayFabMgr.Instance.GetLocalData("ShowNotice") == "1";
                 return _showNotice.Value;
             }
             set
             {
+                if (requiresFormalKV && promptOwner == null) RequirePromptOwner();
+                if (promptOwner != null)
+                {
+                    var read = ReadPrompt();
+                    var serialized = value ? "1" : "0";
+                    if (read.Found != true || read.Value != serialized)
+                    {
+                        LastPromptEdit = KVMgr.WriteKV(promptOwner, "ShowNotice", serialized);
+                        if (!LastPromptEdit.Accepted)
+                            throw PromptFailure($"ShowNotice owner={promptOwner.OwnerInstanceId}: {LastPromptEdit.StateResult.Error}; uncertain={LastPromptEdit.StateResult.LocalCommitMayHaveSucceeded}");
+                    }
+                    RequirePromptOwner();
+                    _showNotice = value;
+                    return;
+                }
                 if (value != _showNotice)
                 {
                     _showNotice = value;
@@ -156,7 +235,9 @@ namespace game
             {
                 return false;
             }
-            if (GContext.container.Resolve<ILocalNotificationService>().IsNoticeOpen)
+            var notification = GContext.container.Resolve<ILocalNotificationService>();
+            if (notification is LocalNotificationService local) local.RequirePromptOwner(this);
+            if (notification.IsNoticeOpen)
             {
                 ShowNotice = true;
                 return false;