refactor(kv): 整理存档接线并清理迁移冗余实现

Client/Assets/Scripts/Services/UserService.cs

@@ -163,7 +163,7 @@ namespace game
 
         internal string CaptureSaveBackend()
         {
-            return config == null ? "playfab" : config.Get<string>("SaveBackend", "playfab");
+            return game.KV.KvRuntimeSelection.CompiledBackend;
         }
 
         internal bool RejectSaveBackend(string backend)
@@ -520,7 +520,7 @@ namespace game
         }
 
 
-        private S101AccountSession apiSession;
+        private GameServerAccountSession apiSession;
         private Task<bool> apiLoginTask;
         private int apiLoginGeneration;
 
@@ -542,7 +542,7 @@ namespace game
             try
             {
                 customServerMgr.ClearAccountSession();
-                var session = new S101AccountSession(customServerMgr.ApiBaseUri);
+                var session = new GameServerAccountSession(customServerMgr.ApiBaseUri);
                 apiSession = session;
                 var result = await session.LoginAsync(requestedId);
                 if (generation != apiLoginGeneration || requestedId != CustomId)