Asset Management fixed

src/core/ApplicationManager.h

@@ -41,6 +41,7 @@ public:
     // Access to managers (for now, will be replaced with dependency injection later)
     RenderManager* getRenderManager() const { return m_renderManager.get(); }
     InputManager* getInputManager() const { return m_inputManager.get(); }
+    AssetManager* getAssetManager() const { return m_assetManager.get(); }
     StateManager* getStateManager() const { return m_stateManager.get(); }
 
 private:
@@ -61,6 +62,7 @@ private:
     // Core managers
     std::unique_ptr<RenderManager> m_renderManager;
     std::unique_ptr<InputManager> m_inputManager;
+    std::unique_ptr<AssetManager> m_assetManager;
     std::unique_ptr<StateManager> m_stateManager;
     
     // Application state