Fix subdomain DNS messaging for Ladill nameservers and retire pending-setup primaries.

Treat ns_auto domains as managed DNS, publish subdomain A records via PowerDNS without failing the UX when the local DNS registry is missing, and promote real linked domains over pending-setup.local placeholders.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Services/Hosting/AdminHostingAssignmentService.php

@@ -42,9 +42,13 @@ class AdminHostingAssignmentService
         }
 
         $primaryDomain = isset($input['primary_domain']) && $input['primary_domain'] !== ''
-            ? (string) $input['primary_domain']
+            ? strtolower(trim((string) $input['primary_domain']))
             : null;
 
+        if ($primaryDomain !== null && PlaceholderPrimaryDomainService::isPlaceholderDomain($primaryDomain)) {
+            $primaryDomain = null;
+        }
+
         $accountType = match ($product->type) {
             'single_domain', 'multi_domain', 'wordpress' => HostingAccount::TYPE_SHARED,
             'vps' => HostingAccount::TYPE_VPS,