docs: update resources API docs

docs/api/resources/textureimportsettings/clone.md

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+# TextureImportSettings::Clone
+
+```cpp
+Core::UniqueRef<ImportSettings> Clone() const override;
+```
+
+创建并返回一份当前设置的深拷贝。
+
+**返回：** `Core::UniqueRef<ImportSettings>` - 新的 `TextureImportSettings` 克隆
+
+**线程安全：** ✅
+
+**示例：**
+
+```cpp
+TextureImportSettings settings;
+settings.SetTextureType(TextureType::Texture2D);
+
+auto cloned = settings.Clone();
+// cloned 是独立的副本，修改不影响原对象
+```
+
+## 相关文档
+
+- [TextureImportSettings 总览](textureimportsettings.md) - 返回类总览