Add AllMarkSeen Functionality to Notification System

- Introduced the AllMarkSeen method in the notification service to mark all notifications as seen for a user, enhancing user experience by allowing bulk actions on notifications.
- Implemented the PublicAllMarkSeen handler to handle HTTP requests for marking all notifications as seen, ensuring proper request validation and response handling.
- Updated the notification client and SDK to support the new AllMarkSeen functionality, improving the overall API capabilities.
- Enhanced API documentation with Swagger comments for the new endpoint, ensuring clarity for API consumers.

pkg/notification/sdk.go

@@ -89,6 +89,11 @@ func (s *SDK) MarkSeen(ctx context.Context, notificationID string) (*MarkSeenRes
 	return s.service.MarkSeen(ctx, notificationID)
 }
 
+// AllMarkSeen marks all notifications as seen for a user
+func (s *SDK) AllMarkSeen(ctx context.Context, userID string) (*MarkSeenResponse, error) {
+	return s.service.AllMarkSeen(ctx, userID)
+}
+
 // NewBuilder creates a new notification builder for fluent API usage
 func (s *SDK) NewBuilder() Builder {
 	return s.service.(*Service).NewBuilder()