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/Actions/Service/UpdateServiceApplicationFromApi.php

@@ -59,6 +59,11 @@ class UpdateServiceApplicationFromApi
             $serviceApplication->fqdn = $parsed['normalized'];
         }
 
+        if (array_key_exists('noindex_domains', $payload)) {
+            // Must run after fqdn is set above: flags are kept only for current domains.
+            $serviceApplication->setNoindexDomains($payload['noindex_domains'] ?? []);
+        }
+
         if (array_key_exists('human_name', $payload)) {
             $serviceApplication->human_name = $payload['human_name'];
         }