fix(monitoring): correct Flask backend URL in version panel

Nikolay Samokhvalovrequested to merge
claude/grafana-version-display-V60eA into main
  • Change port from 5000 to 8000 (gunicorn port)
  • Change service name from monitoring-flask-backend to monitoring_flask_backend

https://gitlab.com/postgres-ai/platform/-/issues/346

Edited by Nikolay Samokhvalov

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