[Feature]: Notification System for Inter-Association Communication #65

Is your feature request related to a problem? Please describe.
As organizations interact with each other in complex hierarchies, there's no efficient way to notify members about important events, resource sharing requests, permission changes, or other cross-organizational activities. This leads to delayed responses, missed communications, and lack of visibility into inter-association activities.

Describe the solution you'd like
Implement a comprehensive notification system for inter-association communication that includes:

• Real-time notifications for resource sharing requests/approvals
• Alerts for permission changes within the hierarchy
• Notifications for hierarchy structure changes (new child organizations, mergers)
• Custom notification preferences per user
• In-app notification center with read/unread status
• Email notification options for critical events
• Notification grouping and prioritization
• Cross-association announcement capabilities
• Context-specific notification delivery based on role and organization

Describe alternatives you've considered

1. Manual email communication outside the system
2. Simple in-app alerts without organization hierarchy awareness
3. Shared communication channels like forums without targeted notifications

Additional context
This feature is essential for the Advanced Association Management MVP to ensure effective communication across hierarchical organizations. It will help maintain transparency and prompt responses to resource sharing requests and other cross-organizational activities.