Tenants can upload multiple CA certificates for enterprise SSO providers
that use private certificate authorities.
- New tenant_ca_certs table (V013) with PEM storage in DB
- Stage/activate/delete lifecycle per CA cert
- Aggregated ca.pem rebuild on activate/delete (atomic .wip swap)
- REST API: GET/POST/DELETE on /api/tenant/ca
- UI: CA Certificates section on SSO page with upload, activate, remove
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>