feat: 优化存档管理和工具槽管理，改进数据类型转换，增强代码可读性

Assets/_Game/Scripts/Core/Save/GameSaveManager.cs

@@ -235,10 +235,10 @@ namespace BaseGames.Core.Save
                 return new SlotSummary
                 {
                     SlotIndex    = slotIndex,
-                    Playtime     = root["Meta"]?["Playtime"]?.Value<float>() ?? 0f,
-                    LastSaved    = root["Meta"]?["LastSaved"]?.Value<string>(),
-                    SceneName    = root["Player"]?["Scene"]?.Value<string>(),
-                    ActiveFormId = root["Player"]?["ActiveFormId"]?.Value<string>(),
+                    Playtime     = (float?)root["Meta"]?["Playtime"]  ?? 0f,
+                    LastSaved    = (string)root["Meta"]?["LastSaved"],
+                    SceneName    = (string)root["Player"]?["Scene"],
+                    ActiveFormId = (string)root["Player"]?["ActiveFormId"],
                 };
             }
             catch { return null; }

Assets/_Game/Scripts/Equipment/ToolSlotManager.cs

@@ -96,9 +96,9 @@ namespace BaseGames.Equipment
 
             // 恢复剩余使用次数（EquipTool 会重置为 maxUses，此处覆盖还原）
             if (data.Tools.ToolStates.TryGetValue("Slot0_Uses", out var uses0))
-                _remainingUses[0] = uses0["uses"]?.Value<int>() ?? _remainingUses[0];
+                _remainingUses[0] = (int?)uses0["uses"] ?? _remainingUses[0];
             if (data.Tools.ToolStates.TryGetValue("Slot1_Uses", out var uses1))
-                _remainingUses[1] = uses1["uses"]?.Value<int>() ?? _remainingUses[1];
+                _remainingUses[1] = (int?)uses1["uses"] ?? _remainingUses[1];
         }
     }
 }

Assets/_Game/Scripts/Progression/AchievementManager.cs

@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 using UnityEngine;
 using BaseGames.Core;
+using BaseGames.Core.Events;
 using BaseGames.Core.Save;
 using BaseGames.Platform;