chore: add VRE stack configs (JupyterHub + Zeppelin) + lakehouse components

- Add VRE directory with JupyterHub + Zeppelin docker-compose configs
- Add Gravitino, Flink, Kafka, MinIO, Trino lakehouse stack
- Add Superset, Metabase, StarRocks analytics tools
- Session reprise après crash 2026-06-01

Infrastructure: 86 conteneurs total
Known issues: Kafka (no ZK conn), Trino (node.env null), JupyterHub (DB path)

vre/jupyterhub/docker-compose.yml

@@ -0,0 +1,41 @@
+version: "3.9"
+
+services:
+  jupyterhub:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    image: smartcity-jupyterhub:latest
+    container_name: jupyterhub
+    restart: unless-stopped
+    networks:
+      - smartcity-shared
+    # Run as root to avoid UID issues, JupyterHub will drop privs
+    user: root
+    environment:
+      - JUPYTERHUB_CRYPT_KEY=a1b2c3d4-e5f6-7890-abcd-ef1234567890
+    volumes:
+      - jupyterhub_data:/srv/jupyterhub
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.jupyterhub.rule=Host(`jupyter.digitribe.fr`)"
+      - "traefik.http.routers.jupyterhub.entrypoints=websecure"
+      - "traefik.http.routers.jupyterhub.tls.certresolver=letsencrypt"
+      - "traefik.http.routers.jupyterhub.service=jupyterhub-svc"
+      - "traefik.http.services.jupyterhub-svc.loadbalancer.server.port=8000"
+      - "traefik.http.services.jupyterhub-svc.loadbalancer.passhostheader=true"
+      - "traefik.docker.network=smartcity-shared"
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/hub/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 5
+      start_period: 30s
+
+networks:
+  smartcity-shared:
+    external: true
+
+volumes:
+  jupyterhub_data:
+    driver: local