Implement multi-channel notification system with:
- Core notification service with email, push, and in-app channels
- Email templates for all notification types (welcome, plant registered,
transport alerts, farm alerts, harvest ready, demand matches, weekly digest)
- Push notification support with VAPID authentication
- In-app notification management with read/unread tracking
- Notification scheduler for recurring and scheduled notifications
- API endpoints for notifications CRUD, preferences, and subscriptions
- UI components (NotificationBell, NotificationList, NotificationItem,
PreferencesForm)
- Full notifications page with preferences management
- Service worker for push notification handling
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