feat: implement notification system with Mailgun email integration

- Add notifications table with migration
- Create NotificationService with area-of-interest matching
- Integrate Mailgun for email delivery
- Add notification API endpoints (get, mark as read, unread count)
- Create scheduled jobs for event reminders and cleanup
- Build NotificationBell component for frontend
- Add notification triggers for reports and events
- Implement comprehensive test script
- Update Header with notification bell
- Add email templates with HTML formatting

Requirements satisfied:
- 10.1: Users can define areas of interest (1-50km radius)
- 10.2: Notifications sent within 10 minutes
- 10.3: Notifications for new reports/events in user area
- 10.4: Configurable notification preferences (email/in-app)

Task 33 completed

server/src/services/scheduledJobs.ts

@@ -7,6 +7,7 @@
 
 import cron, { ScheduledTask } from 'node-cron';
 import { analyticsService } from './analyticsService';
+import { notificationService } from './notificationService';
 
 /**
  * Initialize all scheduled jobs
@@ -28,9 +29,38 @@ export function initializeScheduledJobs() {
 
   console.log('[Scheduled Jobs] ✓ Hotspot calculation job scheduled (every 5 minutes)');
 
+  // Event reminder job - runs every 10 minutes
+  // Requirement 10.2: Send notifications within 10 minutes
+  const eventReminderJob = cron.schedule('*/10 * * * *', async () => {
+    try {
+      console.log('[Scheduled Jobs] Checking for event reminders...');
+      const reminders = await notificationService.sendEventReminders();
+      console.log(`[Scheduled Jobs] Event reminders sent: ${reminders.length} notifications`);
+    } catch (error: any) {
+      console.error('[Scheduled Jobs] Error in event reminder job:', error.message);
+    }
+  });
+
+  console.log('[Scheduled Jobs] ✓ Event reminder job scheduled (every 10 minutes)');
+
+  // Notification cleanup job - runs daily at 2 AM
+  const notificationCleanupJob = cron.schedule('0 2 * * *', async () => {
+    try {
+      console.log('[Scheduled Jobs] Cleaning up old notifications...');
+      const count = await notificationService.cleanupOldNotifications();
+      console.log(`[Scheduled Jobs] Notification cleanup completed: ${count} notifications deleted`);
+    } catch (error: any) {
+      console.error('[Scheduled Jobs] Error in notification cleanup job:', error.message);
+    }
+  });
+
+  console.log('[Scheduled Jobs] ✓ Notification cleanup job scheduled (daily at 2 AM)');
+
   // Return job instances for potential management
   return {
     hotspotJob,
+    eventReminderJob,
+    notificationCleanupJob,
   };
 }
 
@@ -38,13 +68,27 @@ export function initializeScheduledJobs() {
  * Stop all scheduled jobs
  * Useful for graceful shutdown
  */
-export function stopScheduledJobs(jobs: { hotspotJob: ScheduledTask }) {
+export function stopScheduledJobs(jobs: { 
+  hotspotJob: ScheduledTask;
+  eventReminderJob: ScheduledTask;
+  notificationCleanupJob: ScheduledTask;
+}) {
   console.log('[Scheduled Jobs] Stopping all scheduled jobs...');
   
   if (jobs.hotspotJob) {
     jobs.hotspotJob.stop();
     console.log('[Scheduled Jobs] ✓ Hotspot calculation job stopped');
   }
+
+  if (jobs.eventReminderJob) {
+    jobs.eventReminderJob.stop();
+    console.log('[Scheduled Jobs] ✓ Event reminder job stopped');
+  }
+
+  if (jobs.notificationCleanupJob) {
+    jobs.notificationCleanupJob.stop();
+    console.log('[Scheduled Jobs] ✓ Notification cleanup job stopped');
+  }
 }
 
 export default {