### Description: - Implement a notification system that sends both email and in-app notifications for key system events: - Quotation accepted/rejected - Invoice created or overdue - Project assigned to an employee - Use background workers for async email sending.
Description:
Implement a notification system that sends both email and in-app notifications for key system events:
Quotation accepted/rejected
Invoice created or overdue
Project assigned to an employee
Use background workers for async email sending.