Adds GET /admin/sla-runs (filterable by status), GET /admin/escalation-
events (capped, most-recent-first), and GET /admin/products (with
integration status joined in, never the full ProductIntegration row).
None of these existed as a single query before - only per-ticket or
per-integration-id lookups did.
Discovered while planning supporthub-web's 001-agent-admin-ui User
Stories 6-7 (SLA/escalation monitoring, product catalog), the same way
011-agent-ticket-queue was discovered for User Story 1.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
