feat: 优化存档管理，增强链状态获取逻辑，添加 ISaveable 接口支持

Assets/_Game/Scripts/Equipment/ToolSlotManager.cs

@@ -1,4 +1,5 @@
 using UnityEngine;
+using BaseGames.Core;
 using BaseGames.Core.Events;
 using BaseGames.Core.Save;
 using BaseGames.Player.States;
@@ -26,6 +27,9 @@ namespace BaseGames.Equipment
             Debug.Assert(_toolCatalog != null, "[ToolSlotManager] _toolCatalog 未赋值，请在 Inspector 中指定 ToolCatalogSO。", this);
         }
 
+        private void OnEnable()  => ServiceLocator.GetOrDefault<ISaveableRegistry>()?.Register(this);
+        private void OnDisable() => ServiceLocator.GetOrDefault<ISaveableRegistry>()?.Unregister(this);
+
         // ── 装备 ─────────────────────────────────────────────────────────────
         public void EquipTool(int slotIndex, ToolSO tool)
         {