- Add POST /api/eco/ff-upload to receive CSV from browser (saves to /tmp)
- _find_csv() checks /tmp, /app, project root — works local + Docker
- _run_ff_import now takes explicit csv_path parameter
- Frontend: Upload CSV button (file input) → uploads to server first,
then Import into DB — with upload progress messages
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>