Switch backend badges to genbadge

[giovgiac]

Summary

• replace the deprecated coverage-badge dependency with genbadge and enable the required extras
• update the backend CI workflow to collect flake8 output and generate local tests, flake8, and coverage badges via genbadge
• surface the new badges in the backend README and document how to recreate them in the backend testing guide

Testing

• poetry run pytest --junitxml=pytest-results.xml --cov=human_evaluation_tool --cov-report=term-missing --cov-report=xml

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https://chatgpt.com/codex/tasks/task_b_68e8d4b5bc648323975493f05c54f40f

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Ensure genbadge dependency is installed

The workflow now runs poetry run genbadge … to generate SVG badges, but the commit only adds genbadge to backend/pyproject.toml and does not update backend/poetry.lock. The CI job installs dependencies from the lock file (poetry install --with dev), so genbadge is never installed and these steps will fail with Command not found. Run poetry lock (or otherwise update the lock file) so the package is present in CI before invoking it.

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