Refactored step 1: Core Architecture Setup

src/core/ApplicationManager.h

@@ -0,0 +1,75 @@
+#pragma once
+
+#include <memory>
+#include <string>
+
+// Forward declarations
+class RenderManager;
+class InputManager;
+class StateManager;
+class AssetManager;
+class Game;
+class ScoreManager;
+class Starfield;
+class Starfield3D;
+class FontAtlas;
+class LineEffect;
+
+/**
+ * ApplicationManager - Central coordinator for the entire application lifecycle
+ * 
+ * Responsibilities:
+ * - Initialize and shutdown all subsystems
+ * - Coordinate the main application loop
+ * - Manage high-level application state
+ * - Provide clean separation between main() and application logic
+ */
+class ApplicationManager {
+public:
+    ApplicationManager();
+    ~ApplicationManager();
+
+    // Core lifecycle methods
+    bool initialize(int argc, char* argv[]);
+    void run();
+    void shutdown();
+
+    // Application state
+    bool isRunning() const { return m_running; }
+    void requestShutdown() { m_running = false; }
+
+    // Access to managers (for now, will be replaced with dependency injection later)
+    RenderManager* getRenderManager() const { return m_renderManager.get(); }
+    StateManager* getStateManager() const { return m_stateManager.get(); }
+
+private:
+    // Initialization methods
+    bool initializeSDL();
+    bool initializeManagers();
+    bool initializeGame();
+    
+    // Main loop methods
+    void processEvents();
+    void update(float deltaTime);
+    void render();
+    
+    // Cleanup methods
+    void cleanupManagers();
+    void cleanupSDL();
+
+    // Core managers
+    std::unique_ptr<RenderManager> m_renderManager;
+    std::unique_ptr<StateManager> m_stateManager;
+    
+    // Application state
+    bool m_running = false;
+    bool m_initialized = false;
+    
+    // Timing
+    uint64_t m_lastFrameTime = 0;
+    
+    // Configuration
+    int m_windowWidth = 1200;
+    int m_windowHeight = 1000;
+    std::string m_windowTitle = "Tetris (SDL3)";
+};