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/game-object/set-parent.md

@@ -0,0 +1,19 @@
+# GameObject::SetParent
+
+设置父游戏对象。
+
+```cpp
+void SetParent(GameObject* parent);
+void SetParent(GameObject* parent, bool worldPositionStays);
+```
+
+将当前 GameObject 的父对象设置为指定对象。
+
+**参数：**
+- `parent` - 新的父对象，nullptr 表示成为根对象
+- `worldPositionStays` - true 保持世界坐标不变，false 保持本地坐标不变
+
+## 相关文档
+
+- [GameObject 总览](game-object.md)
+- [GetParent](get-parent.md)