Open a separate pgx pool for the monitoring database, wire it into the
SiteDomainMappingService, and surface its health in /readyz. Point compose
at the dedicated monitoring-postgres service and align local/dev configs
with the per-instance ports. Also reformat the site_domain_mapping types
with gofmt while the files are touched.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Add SiteDomainMappingRepository with list/get/create/update/set-active/
delete to back the ops console management UI on top of the now-global
site_domain_mappings table.