chore: remove legacy entry scripts

Yejin Ohrequested to merge
chore/cleanup-legacy-entry-files into main

Remove legacy root-level entry scripts that are no longer used after migrating to the FastAPI + React dashboard structure.

  • Remove legacy Streamlit dashboard entry file: dashboard.py
  • Remove outdated standalone metric test script: main.py
  • Keep FastAPI backend, React frontend, and core etsi_dq modules unchanged

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