docs: Add Component, GameObject, TransformComponent and Scene API documentation

- Add Component class documentation with lifecycle methods
- Add GameObject class documentation with component system
- Add TransformComponent documentation with transform methods
- Add Scene class documentation with GameObject management
- Add SceneManager singleton documentation with scene loading
- Update components.md overview with all component classes
- Update main.md navigation with Scene module

docs/api/components/component/set-enabled.md

@@ -0,0 +1,17 @@
+# Component::SetEnabled
+
+设置组件启用状态。
+
+```cpp
+void SetEnabled(bool enabled);
+```
+
+当启用状态发生变化时，会自动调用 OnEnable 或 OnDisable 回调。
+
+**参数：**
+- `enabled` - true 为启用，false 为禁用
+
+## 相关文档
+
+- [Component 总览](component.md)
+- [IsEnabled](is-enabled.md)