feat(analytics): implement learning analytics feature with data collection and display

server/index.js

@@ -17,6 +17,7 @@ import calendarRoutes from './routes/calendar.js';
 import caldavRoutes from './routes/caldav.js';
 import notificationRoutes from './routes/notifications.js';
 import oauthRoutes from './routes/oauth.js';
+import analyticsRoutes from './routes/analytics.js';
 import { startFederationSync } from './jobs/federationSync.js';
 import { startCalendarReminders } from './jobs/calendarReminders.js';
 
@@ -73,6 +74,7 @@ async function start() {
   app.use('/api/calendar', calendarRoutes);
   app.use('/api/notifications', notificationRoutes);
   app.use('/api/oauth', oauthRoutes);
+  app.use('/api/analytics', analyticsRoutes);
   // CalDAV — mounted outside /api so calendar clients use a clean path
   app.use('/caldav', caldavRoutes);
   // Mount calendar federation receive also under /api/federation for remote instances