feat: Implement Phase 2 cross-cutting services with email and notification enhancements

- Refactor email verification and password reset utilities to use new email service.
- Introduce email delivery queue and notification delivery model for better tracking.
- Enhance file validation and storage services for improved security and ownership management.
- Add cron job for cleaning inactive notifications with retention policy.
- Update document worker to handle document generation and storage more efficiently.
- Implement logging improvements in activity and log workers.
- Create comprehensive documentation for new API endpoints and services.
- Add unit tests for file validation and notification policies to ensure robustness.

app/models/index.js

@@ -64,6 +64,7 @@ db.referenceNumber = require("./referenceNumbers/referenceNumber.model")(sequeli
 // Notifications
 db.notification = require("./notification/notification.model")(sequelize, DataTypes);
 db.userNotification = require("./notification/userNotification.model")(sequelize, DataTypes);
+db.NotificationDelivery = require("./notification/notificationDelivery.model")(sequelize, DataTypes);
 
 /* Associations */
 Object.keys(db).forEach(model => {