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/main.md

@@ -20,6 +20,7 @@
 | **Resources** | [resources/](resources/resources.md) | 资源管理系统 |
 | **Audio** | [audio/](audio/audio.md) | 音频系统 |
 | **Components** | [components/](components/components.md) | ECS 组件系统 |
+| **Scene** | [scene/](scene/scene.md) | 场景管理系统 |
 
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@@ -86,7 +87,10 @@ Math::Matrix4 transform = Math::Matrix4::TRS(position, rotation, scale);
 | Debug | 9 |
 | Core | 6 |
 | Containers | 4 |
-| **总计** | **124** |
+| Audio | 10 |
+| Components | 36 |
+| Scene | 19 |
+| **总计** | **143** |
 
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