feat(web): implement game lifecycle management for SPA navigation

Add stop_game and restart_game FFI functions to properly pause/resume the game loop during page transitions, preventing resource leaks and audio issues when navigating between pages

web/lib/pacman.ts

@@ -0,0 +1,16 @@
+export interface PacmanModule {
+  canvas: HTMLCanvasElement;
+  _start_game?: () => void;
+  _stop_game?: () => void;
+  _restart_game?: () => void;
+  locateFile: (path: string) => string;
+  preRun: unknown[];
+}
+
+export interface PacmanWindow extends Window {
+  Module?: PacmanModule;
+  pacmanReady?: () => void;
+  SDL_CANVAS_ID?: string;
+}
+
+export const getPacmanWindow = (): PacmanWindow => window as unknown as PacmanWindow;