Add MarkSeen Functionality to Notification System

- Implemented the MarkSeen method in the notification client to mark notifications as seen, enhancing user interaction with notifications.
- Added MarkSeenRequest and MarkSeenResponse structs to facilitate the request and response handling for marking notifications.
- Updated the NotificationService interface to include the new MarkSeen method, ensuring consistency across the service layer.
- Enhanced the SDK with a QuickMarkSeen convenience method for easier usage in client applications.
- Included logging for successful and failed attempts to mark notifications as seen, improving traceability and debugging capabilities.

pkg/notification/sdk.go

@@ -79,6 +79,11 @@ func (s *SDK) GetNotifications(ctx context.Context, req *GetNotificationsRequest
 	return s.service.GetNotifications(ctx, req)
 }
 
+// MarkSeen marks a notification as seen
+func (s *SDK) MarkSeen(ctx context.Context, notificationID string) (*MarkSeenResponse, error) {
+	return s.service.MarkSeen(ctx, notificationID)
+}
+
 // NewBuilder creates a new notification builder for fluent API usage
 func (s *SDK) NewBuilder() Builder {
 	return s.service.(*Service).NewBuilder()
@@ -149,6 +154,12 @@ func (s *SDK) GetNotificationsByStatus(ctx context.Context, status string, page,
 	return s.GetNotifications(ctx, req)
 }
 
+// QuickMarkSeen marks a notification as seen (convenience method)
+func (s *SDK) QuickMarkSeen(ctx context.Context, notificationID string) error {
+	_, err := s.MarkSeen(ctx, notificationID)
+	return err
+}
+
 // Batch operations for sending multiple notifications
 
 // BatchRequest represents a batch notification request