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/package-lock.json

@@ -17,8 +17,10 @@
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         "node-cron": "^4.2.1",
         "redis": "^5.9.0",
@@ -982,6 +984,12 @@
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@@ -1750,6 +1758,20 @@
         "tslib": "^2.0.3"
       }
     },
+    "node_modules/mailgun.js": {
+      "version": "12.1.1",
+      "resolved": "https://registry.npmjs.org/mailgun.js/-/mailgun.js-12.1.1.tgz",
+      "integrity": "sha512-8E6JaEPCurhDLu77LFJcB1AwDmGd1Y99hEJBC+BqZSUal6qOJrOzZBEjP1EALI2VLbOXs7OWq4lsmUqRDd1LVA==",
+      "license": "MIT",
+      "dependencies": {
+        "axios": "^1.12.1",
+        "base-64": "^1.0.0",
+        "url-join": "^4.0.1"
+      },
+      "engines": {
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@@ -2423,6 +2445,12 @@
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       }
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+    "node_modules/url-join": {
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+      "license": "MIT"
+    },
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       "resolved": "https://registry.npmjs.org/use-sync-external-store/-/use-sync-external-store-1.6.0.tgz",