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/transform-component/set-as-first-sibling.md

@@ -0,0 +1,22 @@
+# SetAsFirstSibling
+
+Set this transform as the first sibling (index 0).
+
+## Syntax
+
+```cpp
+void SetAsFirstSibling();
+```
+
+## See Also
+
+- [SetSiblingIndex](set-sibling-index)
+- [SetAsLastSibling](set-as-last-sibling)
+
+## Examples
+
+```cpp
+void Example(TransformComponent* transform) {
+    transform->SetAsFirstSibling();
+}
+```