完成输入管理器1

src/engine/core/game_app.h

@@ -14,6 +14,10 @@ class Renderer;
 class Camera;
 }
 
+namespace engine::input {
+class InputManager;
+}
+
 namespace engine::core {        // 命名空间的最佳实践：与文件路径一致
 class Time;
 class Config;
@@ -33,6 +37,7 @@ private:
     std::unique_ptr<engine::render::Renderer> renderer_;
     std::unique_ptr<engine::render::Camera> camera_;
     std::unique_ptr<engine::core::Config> config_;
+    std::unique_ptr<engine::input::InputManager> input_manager_;
 public:
     GameApp();
     ~GameApp();
@@ -62,11 +67,13 @@ private:
     [[nodiscard]] bool initResourceManager();
     [[nodiscard]] bool initRenderer();
     [[nodiscard]] bool initCamera();
+    [[nodiscard]] bool initInputManager();
 
     // 测试用函数
     void testResourceManager();
     void testRenderer();
     void testCamera();
+    void testInputManager();
 };
 
 } // namespace engine::core