Enhance Notification System with New API Endpoints and Response Structures

- Added new endpoints for marking notifications as seen and retrieving detailed notification information for both admin and user contexts, improving the flexibility of the notification system.
- Implemented the MarkSeen and ViewNotification methods in the NotificationHandler, ensuring proper handling of notification visibility and details retrieval.
- Updated the NotificationService interface to include methods for getting notification details and marking notifications as seen, enhancing service capabilities.
- Enhanced the notification response structures to include additional fields such as Image, Seen, and ScheduledAt, providing richer data in API responses.
- Updated API documentation with Swagger comments for the new endpoints and response formats, ensuring clarity for API consumers.

pkg/notification/service.go

@@ -109,6 +109,11 @@ func (s *Service) GetNotifications(ctx context.Context, req *GetNotificationsReq
 	return s.client.GetNotifications(ctx, req)
 }
 
+// GetNotification retrieves a single notification by ID
+func (s *Service) GetNotification(ctx context.Context, notificationID string) (*DetailedNotificationResponse, error) {
+	return s.client.GetNotification(ctx, notificationID)
+}
+
 // MarkSeen marks a notification as seen
 func (s *Service) MarkSeen(ctx context.Context, notificationID string) (*MarkSeenResponse, error) {
 	return s.client.MarkSeen(ctx, notificationID)