Initial commit of Descrybe v2 without local scratch artifacts.

Drop one-shot tmp/axe scripts and agent i18n scratch so the Gitea tree is deployable.

apps/api/internal/seo/errors.go

@@ -0,0 +1,21 @@
+package seo
+
+import "errors"
+
+// Sentinel errors for SEO apply / lookups.
+var (
+	ErrNotFound    = errors.New("not found")
+	ErrInvalidMode = errors.New("mode must be template or ai")
+)
+
+// ClientError reports whether err is a known client-facing SEO validation error.
+func ClientError(err error) (msg string, ok bool) {
+	switch {
+	case err == nil:
+		return "", false
+	case errors.Is(err, ErrInvalidMode):
+		return err.Error(), true
+	default:
+		return "", false
+	}
+}