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。

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Assets/Picture/火球.png.meta

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Assets/Prefabs/武器飞行物/火球.prefab

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Assets/Script/Billboard.cs

@@ -0,0 +1,24 @@
+using UnityEngine;
+
+public class Billboard : MonoBehaviour
+{
+    private Camera _cam;
+
+    private void Awake()
+    {
+        _cam = Camera.main;
+        if (_cam == null)
+        {
+            Debug.LogWarning("[Billboard] No main camera found.");
+        }
+    }
+
+    private void Update()
+    {
+        if (_cam != null)
+        {
+            transform.LookAt(transform.position + _cam.transform.rotation * Vector3.forward,
+                             _cam.transform.rotation * Vector3.up);
+        }
+    }
+}

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Assets/Script/Projectile.cs

@@ -80,7 +80,8 @@ public class Projectile : MonoBehaviour
             }
         }
 
-        transform.forward = direction;
+        // 火球保持 Prefab 固定角度，不随飞行方向旋转
+        // transform.forward = direction;
         transform.position += direction * distance;
     }