feat: live Docker data — containers, services, logs, metrics via dockerode

- Backend: rewrote containers/services/logs/metrics routes to use dockerode
- docker-compose: mount /var/run/docker.sock, run backend as root
- .drone.yml: sync docker-compose.yml from Gitea on deploy
- Frontend: Containers page shows real data with wired start/stop/restart
- Frontend: Services page shows Docker Compose stacks with health status
- Frontend: Metrics page adds disk (docker df) and containers cards + chart legend
- Frontend: Logs page replaces text input with container dropdown + auto-refresh

docker-compose.yml

@@ -24,6 +24,9 @@ services:
       dockerfile: Dockerfile
     container_name: server-manager-backend
     restart: unless-stopped
+    user: root
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
     environment:
       NODE_ENV: production
       PORT: 3001