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

backend/app.js

@@ -24,6 +24,7 @@ import dashboardRouter from './routers/dashboardRouter.js';
 import newsRouter from './routers/newsRouter.js';
 import calendarRouter from './routers/calendarRouter.js';
 import moderationRouter from './routers/moderationRouter.js';
+import pushNotificationRouter from './routers/pushNotificationRouter.js';
 import cors from 'cors';
 import './jobs/sessionCleanup.js';
 
@@ -107,6 +108,7 @@ app.use('/api/socialnetwork', socialnetworkRouter);
 app.use('/api/vocab', vocabRouter);
 app.use('/api/forum', forumRouter);
 app.use('/api/moderation', moderationRouter);
+app.use('/api/push', pushNotificationRouter);
 app.use('/api/falukant', falukantRouter);
 app.use('/api/friendships', friendshipRouter);
 app.use('/api/models', modelsProxyRouter);