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/jupyterhub_config.py

@@ -0,0 +1,31 @@
+# JupyterHub configuration for Smart City VRE
+
+c.JupyterHub.ip = '0.0.0.0'
+c.JupyterHub.port = 8000
+c.JupyterHub.hub_ip = '0.0.0.0'
+
+# Authenticator: Native (username/password signup + login)
+c.JupyterHub.authenticator_class = 'nativeauthenticator.NativeAuthenticator'
+c.Authenticator.admin_users = {'admin'}
+c.Authenticator.allow_all = True
+
+# Spawner
+c.JupyterHub.spawner_class = 'simple'
+c.Spawner.cmd = ['jupyterhub-singleuser']
+c.Spawner.default_url = '/lab'
+
+# Database and cookies
+c.JupyterHub.cookie_secret_file = '/srv/jupyterhub/jupyterhub_cookie_secret'
+c.JupyterHub.db_url = 'sqlite:///jupyterhub.sqlite'
+
+# Base URL
+c.JupyterHub.base_url = '/'
+
+# Trust forwarded headers from Traefik
+c.JupyterHub.tornado_settings = {
+    'headers': {
+        'Content-Security-Policy': "frame-ancestors 'self'"
+    }
+}
+
+c.JupyterHub.shutdown_on_logout = False