refac: allowed image types and the size limit are a domain rule checked by the use case, not by the persistence layer

internal/infrastructure/useCases/CreateImage.go

@@ -13,5 +13,11 @@ func NewCreateImageUseCase(imageRepository image.Repository) *CreateImageUseCase
 }
 
 func (g *CreateImageUseCase) CreateImage(input image.ImageInput) (image.Image, error) {
+	if !image.IsAllowedContentType(input.ContentType) {
+		return image.Image{}, image.ErrImageTypeNotAllowed
+	}
+	if input.Size > image.MaxImageSize {
+		return image.Image{}, image.ErrImageTooLarge
+	}
 	return g.imageRepository.Create(input)
 }