Notifications

In-app notifications and delivery preferences.

• Get user notifications GET /api/notifications
• Dismiss all notifications POST /api/notifications/dismiss-all
• Get notification preferences GET /api/notifications/preferences
• Update notification preferences PUT /api/notifications/preferences
• Mark all notifications as read POST /api/notifications/read-all
• Get unread notification count GET /api/notifications/unread-count
• Dismiss a notification POST /api/notifications/{notification_id}/dismiss
• Mark notification as read POST /api/notifications/{notification_id}/read