根据提供的code differences信息，由于没有具体的代码变更内容，我将生成一个通用的commit message模板：

```
docs(readme): 更新文档说明

- 添加项目使用指南
- 完善API接口说明
- 修正错误的配置示例
```

注意：由于您提供的code differences部分为空，以上是一个示例模板。当您有具体的代码变更时，请提供详细的变更内容以便生成更准确的commit message。

Assets/Scripts/系统脚本/PlayerDataManager.cs

@@ -0,0 +1,176 @@
+using System.Collections.Generic;
+using UnityEngine;
+using System.IO;
+
+[System.Serializable]
+public class PlayerOwnedCharacterJson
+{
+    public string characterId;
+    public int level = 1;
+    public int starLevel = 0;
+}
+
+[System.Serializable]
+public class SavedFormationData
+{
+    public string[] characterIds = new string[0];
+    public int[] cellIndices = new int[0];
+}
+
+[System.Serializable]
+public class PlayerSaveJson
+{
+    public string playerId = "local_player";
+    public PlayerOwnedCharacterJson[] unlockedCharacters = new PlayerOwnedCharacterJson[0];
+    public string[] currentDeck = new string[0];
+    public SavedFormationData savedFormation = new SavedFormationData();
+}
+
+public class PlayerDataManager : MonoBehaviour
+{
+    public static PlayerDataManager Instance { get; private set; }
+
+    [Header("本地玩家 JSON（正式版替换为服务器响应）")]
+    public TextAsset localPlayerJson;
+
+    public List<PlayerCharacterData> ownedCharacters = new List<PlayerCharacterData>();
+    public PlayerCharacterData[] currentDeck = new PlayerCharacterData[5];
+
+    private void Awake()
+    {
+        if (Instance != null && Instance != this)
+        {
+            Destroy(gameObject);
+            return;
+        }
+        Instance = this;
+        InitializeFromJsonOrFallback();
+    }
+
+    private void InitializeFromJsonOrFallback()
+    {
+        TextAsset json = localPlayerJson != null
+            ? localPlayerJson
+            : Resources.Load<TextAsset>("PlayerData");
+
+        if (json != null)
+        {
+            try
+            {
+                var save = JsonUtility.FromJson<PlayerSaveJson>(json.text);
+                if (save != null && save.unlockedCharacters != null)
+                {
+                    ownedCharacters.Clear();
+                    foreach (var entry in save.unlockedCharacters)
+                    {
+                        if (entry == null || string.IsNullOrEmpty(entry.characterId)) continue;
+                        ownedCharacters.Add(new PlayerCharacterData(entry.characterId, Mathf.Max(1, entry.level), Mathf.Max(0, entry.starLevel)));
+                    }
+
+                    currentDeck = new PlayerCharacterData[5];
+                    for (int i = 0; i < save.currentDeck.Length && i < currentDeck.Length; i++)
+                        currentDeck[i] = GetCharacterData(save.currentDeck[i]);
+                    return;
+                }
+            }
+            catch (System.Exception e)
+            {
+                Debug.LogError("玩家 JSON 解析失败：" + e.Message);
+            }
+        }
+
+        InitializeTempData();
+    }
+
+    private void InitializeTempData()
+    {
+        ownedCharacters.Clear();
+        ownedCharacters.Add(new PlayerCharacterData("human_soldier", 1, 0));
+        ownedCharacters.Add(new PlayerCharacterData("archer", 1, 0));
+        ownedCharacters.Add(new PlayerCharacterData("shield_guard", 1, 0));
+        ownedCharacters.Add(new PlayerCharacterData("mage", 1, 0));
+        ownedCharacters.Add(new PlayerCharacterData("elite_soldier", 1, 0));
+
+        currentDeck = new PlayerCharacterData[5];
+        for (int i = 0; i < currentDeck.Length && i < ownedCharacters.Count; i++)
+            currentDeck[i] = ownedCharacters[i];
+    }
+
+    public PlayerCharacterData GetCharacterData(string characterId)
+    {
+        return ownedCharacters.Find(c => c.characterId == characterId);
+    }
+
+    public PlayerCharacterData GetDeckCharacter(int slot)
+    {
+        if (slot < 0 || slot >= currentDeck.Length) return null;
+        return currentDeck[slot];
+    }
+
+    public void UpgradeCharacter(string characterId)
+    {
+        var character = GetCharacterData(characterId);
+        if (character != null) character.level++;
+    }
+
+    /// <summary>
+    /// 保存阵型到 PlayerData.json
+    /// </summary>
+    public void SaveFormation(string[] characterIds, int[] cellIndices)
+    {
+        string path = Application.dataPath + "/Resources/PlayerData.json";
+        
+        try
+        {
+            // 读取现有数据
+            string json = File.ReadAllText(path);
+            var saveData = JsonUtility.FromJson<PlayerSaveJson>(json);
+            
+            // 更新阵型数据
+            saveData.savedFormation = new SavedFormationData
+            {
+                characterIds = characterIds,
+                cellIndices = cellIndices
+            };
+            
+            // 写回文件
+            string updatedJson = JsonUtility.ToJson(saveData, true);
+            File.WriteAllText(path, updatedJson);
+            
+            Debug.Log($"<color=green>✅ 阵型已保存到 PlayerData.json</color>");
+            Debug.Log($"保存了 {characterIds.Length} 个英雄的阵型数据");
+        }
+        catch (System.Exception e)
+        {
+            Debug.LogError($"保存阵型失败: {e.Message}");
+        }
+    }
+
+    /// <summary>
+    /// 从 PlayerData.json 加载阵型
+    /// </summary>
+    public SavedFormationData LoadFormation()
+    {
+        TextAsset json = localPlayerJson != null
+            ? localPlayerJson
+            : Resources.Load<TextAsset>("PlayerData");
+
+        if (json != null)
+        {
+            try
+            {
+                var save = JsonUtility.FromJson<PlayerSaveJson>(json.text);
+                if (save != null && save.savedFormation != null)
+                {
+                    return save.savedFormation;
+                }
+            }
+            catch (System.Exception e)
+            {
+                Debug.LogError("加载阵型失败：" + e.Message);
+            }
+        }
+
+        return new SavedFormationData();
+    }
+}