Complete rewrite of /admin/infra into 4 columns:
- Col 1 (Serveur): CPU, RAM, Disk, System, Services (Caddy, Docker, SSL cert)
- Col 2 (Containers): All Docker containers with CPU%, RAM, state via Docker API
- Col 3 (Redis): Global stats + per-DB (Messenger, Sessions, Cache)
- Col 4 (PostgreSQL): Instance stats + PgBouncer pools/stats
Extract all infra logic into InfraService. Mount Docker socket (read-only)
in PHP container for container stats. Check SSL cert expiry and Caddy status.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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