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

@@ -221,6 +221,9 @@ namespace BaseGames.Core.Save
         }
 
         // ── 存档槽摘要 ────────────────────────────────────────────────────────
+        /// <summary>
+        /// 仅解析 Meta 和 Player 两个顶层字段，避免反序列化整个 SaveData 造成不必要的 GC 压力。
+        /// </summary>
         public async Task<SlotSummary> GetSlotSummaryAsync(int slotIndex)
         {
             if (!_storage.Exists(slotIndex)) return null;
@@ -228,14 +231,14 @@ namespace BaseGames.Core.Save
             if (json == null) return null;
             try
             {
-                var data = JsonConvert.DeserializeObject<SaveData>(json);
+                var root = Newtonsoft.Json.Linq.JObject.Parse(json);
                 return new SlotSummary
                 {
                     SlotIndex    = slotIndex,
-                    Playtime     = data.Meta.Playtime,
+                    Playtime     = (float?)root["Meta"]?["Playtime"]  ?? 0f,
-                    LastSaved    = data.Meta.LastSaved,
+                    LastSaved    = (string)root["Meta"]?["LastSaved"],
-                    SceneName    = data.Player?.Scene,
+                    SceneName    = (string)root["Player"]?["Scene"],
-                    ActiveFormId = data.Player?.ActiveFormId,
+                    ActiveFormId = (string)root["Player"]?["ActiveFormId"],
                 };
             }
             catch { return null; }

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

@@ -25,10 +25,14 @@ namespace BaseGames.Core.Save
         public async Task WriteAsync(int slotIndex, string json)
         {
             var path = GetPath(slotIndex);
-            // 先写临时文件再原子性替换，防止写入中途断电损坏存档
+            // 先写临时文件再原子性替换，防止写入中途断电损坏存档。
+            // File.Replace 要求 destination 必须已存在；首次存档时直接 Move。
             var tmp = path + ".tmp";
             await File.WriteAllTextAsync(tmp, json);
-            File.Replace(tmp, path, path + ".bak", ignoreMetadataErrors: true);
+            if (File.Exists(path))
+                File.Replace(tmp, path, path + ".bak", ignoreMetadataErrors: true);
+            else
+                File.Move(tmp, path);
         }
 
         public async Task<string> ReadAsync(int slotIndex)

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

@@ -34,7 +34,7 @@ namespace BaseGames.Core.Save
     [Serializable]
     public class SaveMeta
     {
-        public string Version      = "2.2";
+        public string Version      = SaveMigrator.CurrentVersion;
         public int    SlotIndex;
         public string LastSaved;        // ISO 8601
         public float  Playtime;

Assets/_Game/Scripts/Equipment/ToolSlotManager.cs

@@ -82,6 +82,9 @@ namespace BaseGames.Equipment
         {
             data.Tools.ToolSlot0 = _slots[0]?.toolId;
             data.Tools.ToolSlot1 = _slots[1]?.toolId;
+            // 持久化剩余使用次数（-1 = 无限，保持原值）
+            data.Tools.ToolStates["Slot0_Uses"] = Newtonsoft.Json.Linq.JObject.FromObject(new { uses = _remainingUses[0] });
+            data.Tools.ToolStates["Slot1_Uses"] = Newtonsoft.Json.Linq.JObject.FromObject(new { uses = _remainingUses[1] });
         }
 
         public void OnLoad(SaveData data)
@@ -90,6 +93,12 @@ namespace BaseGames.Equipment
 
             EquipTool(0, _toolCatalog.Find(data.Tools.ToolSlot0));
             EquipTool(1, _toolCatalog.Find(data.Tools.ToolSlot1));
+
+            // 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] = (int?)uses0["uses"] ?? _remainingUses[0];
+            if (data.Tools.ToolStates.TryGetValue("Slot1_Uses", out var uses1))
+                _remainingUses[1] = (int?)uses1["uses"] ?? _remainingUses[1];
         }
     }
 }

Assets/_Game/Scripts/Player/FormController.cs

@@ -109,7 +109,9 @@ namespace BaseGames.Player
             {
                 if (_config.forms[i]?.formId == data.Player.ActiveFormId)
                 {
-                    SwitchToFormByIndex(i);
+                    // 直接赋值，不触发事件——加载时场景尚未完全就绪，订阅者（WeaponManager 等）
+                    // 会在各自 OnEnable + Register → OnLoad 回调中自行恢复状态。
+                    CurrentForm = _config.forms[i];
                     return;
                 }
             }

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;
 
@@ -97,6 +98,9 @@ namespace BaseGames.Progression
                 if (_states.TryGetValue(kv.Key, out var state))
                     state.Progress = kv.Value.Percent;
             }
+
+            // 加载后立即重新评估所有未解锁成就，避免离线满足条件的成就须等到下次游戏事件才触发。
+            EvaluateAll(saveData);
         }
 
         // ── 轮询检查 ──────────────────────────────────────────────────────────

Assets/_Game/Scripts/UI/Menus/SaveSlotController.cs

@@ -33,11 +33,18 @@ namespace BaseGames.UI.Menus
         {
             var svc = ServiceLocator.GetOrDefault<ISaveService>();
             if (svc == null) return;
+
+            // 并行加载所有槽位摘要，减少主菜单等待时间
+            var tasks = new Task<SlotSummary>[_slotUIs.Length];
+            for (int i = 0; i < _slotUIs.Length; i++)
+                tasks[i] = svc.GetSlotSummaryAsync(i);
+
+            var summaries = await Task.WhenAll(tasks);
+
             for (int i = 0; i < _slotUIs.Length; i++)
             {
                 if (_slotUIs[i] == null) continue;
-                var summary = await svc.GetSlotSummaryAsync(i);
+                _slotUIs[i].Refresh(summaries[i]);
-                _slotUIs[i].Refresh(summary);
             }
         }