- LinkResponse/UnknownClientResponse Pydantic schemas with from_attributes
- Link service with get_links, get_device_links, get_site_links, get_unknown_clients
- Unknown clients query uses DISTINCT ON for latest registration per MAC
- 4 REST endpoints: tenant links, device links, site links, unknown clients
- Interface and link discovery subscribers wired into FastAPI lifespan start/stop
- Links router registered at /api prefix
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>