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/notification/userNotification.model.js

@@ -41,11 +41,13 @@ module.exports = (sequelize, DataTypes) => {
   userNotification.associate = (models) => {
     userNotification.belongsTo(models.User, {
       foreignKey: "user_id",
+      as: "user",
       constraints: false,
     });
 
     userNotification.belongsTo(models.notification, {
       foreignKey: "notification_id",
+      as: "notification",
       constraints: false,
     });
   };