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Pin Loki query-frontend callback address to loopback

Aiho Tehisaru requested to merge fix/loki-frontend-address into trunk

Under network_mode: host, frontend.address auto-detection (netutil.PrivateNetworkInterfacesWithFallback) picks up unrelated Docker bridge gateways on the host instead of loopback, causing "error notifying frontend about finished query" / connection refused on every Grafana query.

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

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