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
```

Assets/Script/系统脚本/BuffSystem.cs

@@ -0,0 +1,128 @@
+using UnityEngine;
+using System.Collections.Generic;
+
+/// <summary>
+/// 增益系统管理器（单例）
+/// 管理全局增益效果的应用
+/// </summary>
+public class BuffSystem : MonoBehaviour
+{
+    private static BuffSystem instance;
+    public static BuffSystem Instance
+    {
+        get
+        {
+            if (instance == null)
+            {
+                var go = new GameObject("BuffSystem");
+                instance = go.AddComponent<BuffSystem>();
+                DontDestroyOnLoad(go);
+            }
+            return instance;
+        }
+    }
+
+    private void Awake()
+    {
+        if (instance != null && instance != this)
+        {
+            Destroy(gameObject);
+            return;
+        }
+        instance = this;
+    }
+
+    /// <summary>
+    /// 应用群体治疗增益
+    /// </summary>
+    public void ApplyGroupHeal(float healAmount)
+    {
+        var allies = FindObjectsOfType<UnitBase>();
+        int healedCount = 0;
+
+        foreach (var unit in allies)
+        {
+            var team = unit.GetComponent<UnitTeam>();
+            if (team != null && team.teamId == 0) // 友方
+            {
+                var healthBar = unit.GetComponent<WorldHealthBar>();
+                if (healthBar != null)
+                {
+                    healthBar.Heal(healAmount);
+                    healedCount++;
+                }
+            }
+        }
+
+        Debug.Log($"群体治疗：治疗了 {healedCount} 个友方单位，每个恢复 {healAmount} 生命");
+    }
+
+    /// <summary>
+    /// 应用全局攻速增益
+    /// </summary>
+    public void ApplyGlobalAttackSpeedBuff(float speedMultiplier)
+    {
+        var allies = FindObjectsOfType<UnitBase>();
+        int buffedCount = 0;
+
+        foreach (var unit in allies)
+        {
+            var team = unit.GetComponent<UnitTeam>();
+            if (team != null && team.teamId == 0) // 友方
+            {
+                // 使用 UnitBase 的攻速倍增系统
+                unit.MultiplyAttackSpeed(speedMultiplier, 3f); // 最高3倍攻速
+                buffedCount++;
+            }
+        }
+
+        Debug.Log($"全局攻速增益：{buffedCount} 个友方单位攻速提升 {(speedMultiplier - 1) * 100}%");
+    }
+
+    /// <summary>
+    /// 应用全局攻击力增益
+    /// </summary>
+    public void ApplyGlobalAttackBuff(float attackMultiplier)
+    {
+        var allies = FindObjectsOfType<UnitBase>();
+        int buffedCount = 0;
+
+        foreach (var unit in allies)
+        {
+            var team = unit.GetComponent<UnitTeam>();
+            if (team != null && team.teamId == 0) // 友方
+            {
+                unit.attackPower *= attackMultiplier;
+                buffedCount++;
+            }
+        }
+
+        Debug.Log($"全局攻击增益：{buffedCount} 个友方单位攻击力提升 {(attackMultiplier - 1) * 100}%");
+    }
+
+    /// <summary>
+    /// 应用全局生命增益
+    /// </summary>
+    public void ApplyGlobalHealthBuff(float healthMultiplier)
+    {
+        var allies = FindObjectsOfType<UnitBase>();
+        int buffedCount = 0;
+
+        foreach (var unit in allies)
+        {
+            var team = unit.GetComponent<UnitTeam>();
+            if (team != null && team.teamId == 0) // 友方
+            {
+                var healthBar = unit.GetComponent<WorldHealthBar>();
+                if (healthBar != null)
+                {
+                    healthBar.maxHealth *= healthMultiplier;
+                    healthBar.currentHealth *= healthMultiplier;
+                    buffedCount++;
+                }
+            }
+        }
+
+        Debug.Log($"全局生命增益：{buffedCount} 个友方单位生命值提升 {(healthMultiplier - 1) * 100}%");
+    }
+}