feat: Sites feature backend

api/pkg/apperr/messages.go

@@ -57,3 +57,13 @@ const CachePurgeScopeErrorMessage = "Scope must be all, unused, variant or image
 const CachePurgeTargetErrorMessage = "A variant name or an image id is required for this scope."
 const VariantUnknownMessage = "Unknown variant"
 const VariantUnsupportedParameterMessage = "Unsupported parameter"
+const SiteNotFoundErrorMessage = "site_not_found"
+const SiteKeyTakenErrorMessage = "site_key_taken"
+const SiteHasArticlesErrorMessage = "site_has_articles"
+const DefaultSiteErrorMessage = "default_site"
+const SiteKeyImmutableErrorMessage = "key_immutable"
+const InvalidSiteURLErrorMessage = "invalid_site_url"
+const InvalidLocaleErrorMessage = "invalid_locale"
+const SiteImageNotFoundErrorMessage = "image_not_found"
+const UseSetDefaultErrorMessage = "use_set_default"
+const InvalidReassignErrorMessage = "invalid_reassign"