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/get-components.md

@@ -0,0 +1,21 @@
+# GameObject::GetComponents
+
+获取游戏对象上所有指定类型的组件。
+
+```cpp
+template<typename T>
+std::vector<T*> GetComponents();
+
+template<typename T>
+std::vector<const T*> GetComponents() const;
+```
+
+**模板参数：**
+- `T` - 组件类型
+
+**返回：** `std::vector<T*>` - 包含所有匹配组件的向量
+
+## 相关文档
+
+- [GameObject 总览](game-object.md)
+- [GetComponent](get-component.md)