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Add LAN device discovery (ping sweep + ARP, known/unknown labeling)

Runs as a host-level systemd timer on CT122 (scripts/discover-devices.sh)
rather than inside the api container, since real ARP entries live in the
host's network namespace, not Docker's bridge network. See
docs/device-discovery.md for the full writeup, including why literal
passive-only ARP reading was dropped (near-empty result in practice).

API reads the resulting JSON file each poll cycle, cross-references
config/hosts.yaml's knownDevices list by IP, and serves /api/devices.
Dashboard gets a new "Network Devices" table.

Closes #9.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

2026-07-12 20:49:22 -06:00

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SYSTEMD

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 [Unit]
 Description=Run homelab-monitor LAN device discovery every 5 minutes
 [Timer]
 OnBootSec=1min
 OnUnitActiveSec=5min
 [Install]
 WantedBy=timers.target