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/Models/Domain.php

@@ -121,4 +121,17 @@ class Domain extends Model
         return (string) $this->status === 'verified'
             && (string) $this->onboarding_state === self::STATE_ACTIVE;
     }
+
+    /** True when Ladill should publish zone records (nameserver / managed DNS path). */
+    public function usesManagedDns(): bool
+    {
+        if ((string) $this->dns_mode === 'managed') {
+            return true;
+        }
+
+        return in_array((string) $this->onboarding_mode, [
+            self::MODE_NS_AUTO,
+            self::MODE_RESELLER_AUTO,
+        ], true);
+    }
 }