Aggiunge overlay server-side burn-in e stabilizza diretta live.

Tabellone, badge e brand sono ricodificati nel flusso _air via OverlayRelay;
sync punteggio HTTP, volume condiviso rails/sidekiq, qualità 720p migliorata
e badge CONNECTING in ripresa da pausa.

Co-authored-by: Cursor <cursoragent@cursor.com>

infra/scripts/setup_garage_production.sh

@@ -14,6 +14,13 @@ bash "${ROOT}/scripts/ensure_garage_prod_config.sh"
 echo "Avvio Garage..."
 docker compose -f docker-compose.prod.yml --env-file .env up -d garage
 
+avail_gb="$(df -BG / 2>/dev/null | awk 'NR==2 {print $4}' | tr -d 'G')"
+reserve="${GARAGE_RESERVE_GB:-20}"
+cap_gb=$((avail_gb - reserve))
+[ "$cap_gb" -lt 10 ] && cap_gb=10
+export GARAGE_NODE_CAPACITY="${GARAGE_NODE_CAPACITY:-${cap_gb}G}"
+echo "Capacità nodo Garage: ${GARAGE_NODE_CAPACITY} (disco ~${avail_gb}G, riserva ${reserve}G)"
+
 bash "${ROOT}/scripts/setup_garage_replays.sh"
 
 echo "Riavvio Rails e Sidekiq..."