Register issued certs with Ladill Domains central SSL registry

After provisioning a site cert on its node, report it to Domains' central SSL
registry (best-effort, non-blocking) so Domains tracks every platform cert.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/Jobs/ProvisionHostingSslJob.php

@@ -70,6 +70,9 @@ class ProvisionHostingSslJob implements ShouldQueue
                 'site_id' => $this->siteId,
                 'domain' => $site->domain,
             ]);
+
+            // Record the cert in Ladill Domains' central SSL registry (best-effort).
+            app(\App\Services\Ssl\CentralSslRegistry::class)->register($site->domain, $site->ssl_expires_at);
         } catch (\Throwable $exception) {
             $message = $exception->getMessage();