Implement Communication and Notification System

[Barham-debug]

Implement communication and notification system:

1. Email Notifications:

   • Activity updates
   • Registration confirmations
   • Attendance reminders
   • Schedule changes
   • Important announcements

2. In-App Communication:

   • Message board
   • Direct messaging
   • Announcements system
   • Group chats for activities

3. Communication Features:

   • Template management
   • Notification preferences
   • Message scheduling
   • Read receipts
   • File sharing

Technical Requirements:

1. Email System:

   • Email service integration
   • Template engine
   • Queue management
   • Delivery tracking

2. Messaging System:

   • Real-time messaging
   • Message storage
   • File uploads
   • User presence

3. Frontend Components:

   • Messaging interface
   • Notification center
   • Preference settings
   • Announcement board