feat: image variants engine

internal/infrastructure/persistence/repositories/imageRepository.go

@@ -101,6 +101,12 @@ func (i ImageRepository) Counts() (domain.Counts, error) {
 	return domain.Counts{All: int(all), DuplicateGroups: int(groups)}, nil
 }
 
+func (i ImageRepository) ExistsByStoredName(storedName string) (bool, error) {
+	var matches int64
+	err := i.db.Model(&entity.Image{}).Where("path = ?", domain.PublicPath(storedName)).Limit(1).Count(&matches).Error
+	return matches > 0, err
+}
+
 func (i ImageRepository) duplicatedHashes() *gorm.DB {
 	return i.db.Model(&entity.Image{}).
 		Select("sha256").