Add DNS monitoring and refresh functionality

Introduce DNS monitoring: add DnsService (comprehensive DNS lookup, crt.sh discovery, Cloudflare detection, IP enrichment) and a new DnsRecord model to persist snapshots, manage diffs, and provide queries/stats. Update DomainController to support a dns_monitoring_enabled flag, refactor WHOIS/DNS refresh logic into performWhoisRefresh/performDnsRefresh, and add endpoints for refreshWhois, refreshDns and refreshAll; send notifications when DNS monitoring is toggled. Add UI templates/tabs for DNS, billing, notifications, overview, SSL and WHOIS and wire DNS data into the domain view; expose cached IP details. Add cron/check_dns.php and migration 027_add_dns_monitoring.sql (and include it in installer migration lists). Other tweaks: safer EmailHelper subject handling, TldRegistry search improvements, domain sorting using an effective status (expiring_soon), Discord channel null-safe fields, settings UI additions (domain_view_template and cron staleness warnings), and route/migration updates. This enables scheduled and manual DNS scans with persistent records and notifications.

app/Views/domains/view.twig

@@ -50,11 +50,11 @@
         {% endfor %}
     </div>
     <div class="flex gap-2 items-center">
-        <form method="POST" action="/domains/{{ domain.id }}/refresh" class="inline">
+        <form method="POST" action="/domains/{{ domain.id }}/refresh-whois" class="inline">
             {{ csrf_field() }}
             <button type="submit" class="inline-flex items-center justify-center px-3 py-2 bg-green-600 text-white text-xs rounded-lg hover:bg-green-700 transition-colors font-medium min-w-[80px] h-[32px]">
                 <i class="fas fa-sync-alt mr-1.5"></i>
-                Refresh
+                Refresh WHOIS
             </button>
         </form>
         <a href="/domains/{{ domain.id }}/edit?from=/domains/{{ domain.id }}" class="inline-flex items-center justify-center px-3 py-2 bg-blue-600 text-white text-xs rounded-lg hover:bg-blue-700 transition-colors font-medium min-w-[80px] h-[32px]">