Refactor code structure for improved readability and maintainability; optimize performance across multiple modules.

backend/routers/pushNotificationRouter.js

@@ -0,0 +1,12 @@
+import express from 'express';
+import { authenticate } from '../middleware/authMiddleware.js';
+import pushNotificationController from '../controllers/pushNotificationController.js';
+
+const router = express.Router();
+router.use(authenticate);
+router.put('/devices', pushNotificationController.registerDevice);
+router.delete('/devices/:token', pushNotificationController.disableDevice);
+router.get('/settings', pushNotificationController.getSettings);
+router.put('/settings', pushNotificationController.updateSettings);
+
+export default router;