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/Dockerfile

@@ -0,0 +1,26 @@
+# Dockerfile for JupyterHub with authenticator
+FROM jupyterhub/jupyterhub:5.3.0
+
+USER root
+
+RUN apt-get update && apt-get install -y --no-install-recommends git && rm -rf /var/lib/apt/lists/*
+
+RUN pip install --no-cache-dir \
+    git+https://github.com/jupyterhub/nativeauthenticator.git@main \
+    oauthenticator \
+    jupyterhub-idle-culler \
+    jupyterlab \
+    notebook
+
+# Create the directory structure JupyterHub expects for DB
+# JupyterHub joins data_files_path + dirname(db_path), so we create the composed path
+RUN mkdir -p /srv/jupyterhub/srv/jupyterhub && \
+    chown -R 1000:1000 /srv/jupyterhub
+
+COPY jupyterhub_config.py /srv/jupyterhub/jupyterhub_config.py
+
+WORKDIR /srv/jupyterhub
+
+EXPOSE 8000
+
+CMD ["jupyterhub", "-f", "/srv/jupyterhub/jupyterhub_config.py"]