fix(docker): bind webui to 0.0.0.0 for container deployment

The CMD ran 'python src/webui/app.py' which defaults to --host 127.0.0.1,
unreachable from outside the container. Bind 0.0.0.0:5000 explicitly.
No --dev flag => PRODUCTION mode (admin routes 404). Deployed at
ietf.nennemann.de (see dev-journal).

Dockerfile

@@ -21,4 +21,6 @@ ENV PYTHONUNBUFFERED=1
 
 EXPOSE 5000
 
-CMD ["python", "src/webui/app.py"]
+# Bind 0.0.0.0 so the container is reachable from the host/reverse proxy.
+# No --dev flag => PRODUCTION mode (admin routes return 404).
+CMD ["python", "src/webui/app.py", "--host", "0.0.0.0", "--port", "5000"]