[bojemoi] feat(monitoring): alloy-worker global sur workers + dashboard nym-proxy logs

Commit ff59e45

Description

• Nouveau service base_alloy-worker (mode global, node.role==worker)
• Collecte logs Docker via socket local (/var/run/docker.sock)
• Label container_name exposé via discovery.relabel
• Logs nym-proxy (et tous borodino_*) désormais dans Loki {job=docker-worker}
• Dashboard Grafana: Nym Proxy — status, connexions, erreurs, logs temps réel

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