Cross-references each candidate host IP with lan_devices (known) so a tile shows
e.g. 'H Tower' instead of '192.168.1.15:32400'.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Adds GET /api/health/services returning registry services grouped by
category with merged cached status and per-group healthy counts, and
POST /api/health/check (owner-only) that enqueues a health.check
pg-boss job. Registers the health_check worker in the jobs index.