feat(domains): add per-domain noindex support

Flagged domains are served with X-Robots-Tag: noindex, nofollow via
Traefik and Caddy routing labels, so an auto-generated technical domain
can be excluded from indexing while the production domain on the same
resource stays indexable.

app/Support/ValidationPatterns.php

@@ -598,7 +598,7 @@ class ValidationPatterns
      * Normalize URL components that are case-insensitive while preserving
      * case-sensitive path, query, and fragment components.
      */
-    private static function normalizeApplicationDomainUrl(string $url): string
+    public static function normalizeApplicationDomainUrl(string $url): string
     {
         $components = parse_url($url);