docs: update resources API docs

docs/api/resources/textureimportsettings/settargetformat.md

@@ -0,0 +1,28 @@
+# TextureImportSettings::SetTargetFormat / GetTargetFormat
+
+```cpp
+void SetTargetFormat(TextureFormat format);
+TextureFormat GetTargetFormat() const;
+```
+
+设置或获取目标纹理格式。
+
+**参数：**
+- `format` - 目标格式（参见 `TextureFormat` 枚举）
+
+**返回：** `TextureFormat` / `void`
+
+**线程安全：** ✅
+
+**示例：**
+
+```cpp
+TextureImportSettings settings;
+settings.SetTargetFormat(TextureFormat::RGBA8);
+TextureFormat format = settings.GetTargetFormat(); // TextureFormat::RGBA8
+```
+
+## 相关文档
+
+- [TextureImportSettings 总览](textureimportsettings.md) - 返回类总览
+- [Texture](../texture/texture.md) - 纹理格式定义