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>
Shared web hosting extracted from the platform monolith, with CI deploy
to /var/www/ladill-hosting matching Bird/Domains/Email.
Co-authored-by: Cursor <cursoragent@cursor.com>