Create ISceneManager interface and fix GetSceneManager return type

- Created ISceneManager interface with Editor需要的 SceneManager 方法
- SceneManager now implements ISceneManager
- IEditorContext::GetSceneManager() now returns ISceneManager& instead of void*
- Removed SceneManager::GetSceneManagerConcrete() method
- Updated HierarchyPanel and InspectorPanel to use ISceneManager interface

editor/src/panels/InspectorPanel.cpp

@@ -1,6 +1,6 @@
 #include "InspectorPanel.h"
 #include "Core/EditorContext.h"
-#include "Managers/SceneManager.h"
+#include "Core/ISceneManager.h"
 #include "UI/UI.h"
 #include <XCEngine/Debug/Logger.h>
 #include <imgui.h>
@@ -38,8 +38,8 @@ void InspectorPanel::Render() {
     m_selectedEntityId = m_context->GetSelectionManager().GetSelectedEntity();
     
     if (m_selectedEntityId) {
-        auto* sceneManager = static_cast<SceneManager*>(m_context->GetSceneManager());
-        auto* gameObject = sceneManager->GetEntity(m_selectedEntityId);
+        auto& sceneManager = m_context->GetSceneManager();
+        auto* gameObject = sceneManager.GetEntity(m_selectedEntityId);
         if (gameObject) {
             RenderGameObject(gameObject);
         } else {