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接口描述
- 修正错误的配置示例
```

注意：由于您提供的code differences部分为空，无法确定具体的变更类型和范围。实际使用时请根据真实变更内容替换相应的type、scope、subject和body信息。

Assets/Script/PlayerSkillSystem.cs

@@ -0,0 +1,160 @@
+using UnityEngine;
+using UnityEngine.UI;
+
+/// <summary>
+/// 玩家技能系统（召唤师技能）
+/// 管理技能释放和冷却
+/// </summary>
+public class PlayerSkillSystem : MonoBehaviour
+{
+    [Header("技能1：群体治疗")]
+    public Button skill1Button;
+    public Text skill1CooldownText;
+    public float skill1Cooldown = 20f;
+    public float skill1HealAmount = 100f;
+    private float skill1RemainingCooldown = 0f;
+
+    [Header("技能2：全屏AOE")]
+    public Button skill2Button;
+    public Text skill2CooldownText;
+    public float skill2Cooldown = 20f;
+    public float skill2Damage = 80f;
+    private float skill2RemainingCooldown = 0f;
+
+    private void Start()
+    {
+        // 绑定按钮点击事件
+        if (skill1Button != null)
+        {
+            skill1Button.onClick.AddListener(UseSkill1);
+        }
+
+        if (skill2Button != null)
+        {
+            skill2Button.onClick.AddListener(UseSkill2);
+        }
+    }
+
+    private void Update()
+    {
+        // 更新技能1冷却
+        if (skill1RemainingCooldown > 0)
+        {
+            skill1RemainingCooldown -= Time.deltaTime;
+            if (skill1Button != null)
+            {
+                skill1Button.interactable = false;
+            }
+            if (skill1CooldownText != null)
+            {
+                skill1CooldownText.text = Mathf.CeilToInt(skill1RemainingCooldown).ToString();
+                skill1CooldownText.gameObject.SetActive(true);
+            }
+        }
+        else
+        {
+            if (skill1Button != null)
+            {
+                skill1Button.interactable = true;
+            }
+            if (skill1CooldownText != null)
+            {
+                skill1CooldownText.gameObject.SetActive(false);
+            }
+        }
+
+        // 更新技能2冷却
+        if (skill2RemainingCooldown > 0)
+        {
+            skill2RemainingCooldown -= Time.deltaTime;
+            if (skill2Button != null)
+            {
+                skill2Button.interactable = false;
+            }
+            if (skill2CooldownText != null)
+            {
+                skill2CooldownText.text = Mathf.CeilToInt(skill2RemainingCooldown).ToString();
+                skill2CooldownText.gameObject.SetActive(true);
+            }
+        }
+        else
+        {
+            if (skill2Button != null)
+            {
+                skill2Button.interactable = true;
+            }
+            if (skill2CooldownText != null)
+            {
+                skill2CooldownText.gameObject.SetActive(false);
+            }
+        }
+    }
+
+    /// <summary>
+    /// 使用技能1：群体治疗
+    /// </summary>
+    public void UseSkill1()
+    {
+        if (skill1RemainingCooldown > 0)
+        {
+            return;
+        }
+
+        Debug.Log($"释放技能1：群体治疗（恢复 {skill1HealAmount} 生命）");
+
+        // 对所有友方单位施加治疗
+        BuffSystem.Instance.ApplyGroupHeal(skill1HealAmount);
+
+        // 开始冷却
+        skill1RemainingCooldown = skill1Cooldown;
+
+        // TODO: 播放技能特效
+    }
+
+    /// <summary>
+    /// 使用技能2：全屏AOE伤害
+    /// </summary>
+    public void UseSkill2()
+    {
+        if (skill2RemainingCooldown > 0)
+        {
+            return;
+        }
+
+        Debug.Log($"释放技能2：全屏AOE（造成 {skill2Damage} 伤害）");
+
+        // 对所有敌方单位造成伤害
+        var enemies = FindObjectsOfType<UnitBase>();
+        int hitCount = 0;
+
+        foreach (var unit in enemies)
+        {
+            var team = unit.GetComponent<UnitTeam>();
+            if (team != null && team.teamId == 1) // 敌方
+            {
+                var healthBar = unit.GetComponent<WorldHealthBar>();
+                if (healthBar != null && !healthBar.IsDead)
+                {
+                    healthBar.TakeDamage(skill2Damage);
+                    hitCount++;
+                }
+            }
+        }
+
+        Debug.Log($"全屏AOE命中 {hitCount} 个敌人");
+
+        // 开始冷却
+        skill2RemainingCooldown = skill2Cooldown;
+
+        // TODO: 播放技能特效
+    }
+
+    /// <summary>
+    /// 重置所有技能冷却（测试用）
+    /// </summary>
+    public void ResetAllCooldowns()
+    {
+        skill1RemainingCooldown = 0f;
+        skill2RemainingCooldown = 0f;
+    }
+}