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/get-parent.md

@@ -0,0 +1,32 @@
+# GetParent
+
+Get the parent transform.
+
+## Syntax
+
+```cpp
+TransformComponent* GetParent() const;
+```
+
+## Returns
+
+Returns a pointer to the parent `TransformComponent`, or `nullptr` if this transform has no parent.
+
+## Remarks
+
+Returns the parent transform in the transform hierarchy. The parent transform affects this transform's world position, rotation, and scale.
+
+## See Also
+
+- [SetParent](set-parent)
+
+## Examples
+
+```cpp
+void Example(TransformComponent* transform) {
+    TransformComponent* parent = transform->GetParent();
+    if (parent) {
+        XC_LOG_INFO("Has parent: {}", parent->GetName());
+    }
+}
+```