notifications: implementation

Summary by CodeRabbit

• New Features

  • Introduced a comprehensive notifications module with features to create, list, update, and manage notifications.
  • Added user-specific notification management including marking notifications as read or unread.
  • Implemented ratification service for competition result management.
  • Enhanced team memberships and tickets services to retrieve user IDs and account UUIDs based on various criteria.

• Enhancements

  • Updated staff privileges to include the ability to manage notifications.

• Bug Fixes

  • Improved handling of imports and dependencies in various services for better performance and maintainability.