refactor: 重构项目结构和资源管理

- 将主程序代码和资源文件移动到Game目录下
- 更新构建脚本以适配新的目录结构
- 重构应用初始化流程，移除冗余代码
- 更新着色器文件路径和资源管理逻辑
- 删除废弃的windows.lua构建脚本
- 优化Switch平台构建配置

Game/src/main.cpp

@@ -0,0 +1,34 @@
+#include "SDL_log.h"
+#include <SDL2/SDL.h>
+#include <frostbite2D/core/application.h>
+#include <frostbite2D/core/window.h>
+#include <frostbite2D/graphics/renderer.h>
+#include <frostbite2D/graphics/texture.h>
+#include <glad/glad.h>
+
+using namespace frostbite2D;
+
+int main(int argc, char **argv) {
+  AppConfig config = AppConfig::createDefault();
+  config.appName = "Frostbite2D Test App";
+  config.appVersion = "1.0.0";
+  config.windowConfig.width = 800;
+  config.windowConfig.height = 600;
+  config.windowConfig.title = "Frostbite2D - Renderer Test";
+
+  Application& app = Application::get();
+
+  if (!app.init(config)) {
+    SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to initialize application!");
+    return -1;
+  }
+  
+  SDL_Log("Starting main loop...");
+
+  app.run();
+
+  app.shutdown();
+
+  SDL_Log("Application exited normally");
+  return 0;
+}