chore: align slurp config and scaffolding

pkg/slurp/storage/backup_manager.go

@@ -164,6 +164,8 @@ func (bm *BackupManagerImpl) CreateBackup(
 		Incremental:     config.Incremental,
 		ParentBackupID:  config.ParentBackupID,
 		Status:          BackupStatusInProgress,
+		Progress:        0,
+		ErrorMessage:    "",
 		CreatedAt:       time.Now(),
 		RetentionUntil:  time.Now().Add(config.Retention),
 	}
@@ -707,6 +709,7 @@ func (bm *BackupManagerImpl) validateFile(filePath string) error {
 func (bm *BackupManagerImpl) failBackup(job *BackupJob, backupInfo *BackupInfo, err error) {
 	bm.mu.Lock()
 	backupInfo.Status = BackupStatusFailed
+	backupInfo.Progress = 0
 	backupInfo.ErrorMessage = err.Error()
 	job.Error = err
 	bm.mu.Unlock()