Label all agentmon docker-compose services with agentmon.monitor=true
and agentmon.group=agentmon so the swarm-monitor picks them up.
Adds Group field to ServiceSnapshot, probes /healthz for api/web roles,
and renders a separate "Agentmon" section below Swarm Services on the
Infrastructure page with new api and worker card renderers.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Replace exec.CommandContext calls (docker ps, docker inspect, nc -z) with
direct HTTP calls over the Unix socket using Go's net/http + custom transport.
Also removes netcat-openbsd from Dockerfile since nc is no longer used.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
William Valentin