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/singleuser/Dockerfile

@@ -0,0 +1,27 @@
+# Dockerfile for JupyterHub single-user notebooks
+# Includes JupyterLab, common data science libs, and InfluxDB client
+FROM jupyter/scipy-notebook:latest
+
+USER root
+
+# Install additional packages for smart city data analysis
+RUN pip install --no-cache-dir \
+    influxdb-client \
+    pandas \
+    numpy \
+    matplotlib \
+    plotly \
+    folium \
+    requests \
+    sqlalchemy \
+    psycopg2-binary \
+    sqlalchemy \
+    ipywidgets \
+    jupyterlab-git
+
+# Switch back to notebook user
+USER ${NB_UID}
+
+EXPOSE 8888
+
+CMD ["jupyterhub-singleuser"]