feat: add ruff and pip-audit CI gates, fix style violations, and add … #133

Job	Run time
Frontend unit tests (vitest) (ubuntu-latest)	18s
Frontend unit tests (vitest) (windows-latest)	42s
ruff + pip-audit (ubuntu-latest)	22s
API integration tests + coverage (ubuntu-latest)	22s
Verify prod requirements.txt is sufficient	9s
API integration tests + coverage (windows-latest)	1m 17s
mypy	20s
pytest (windows-latest)	43s
ruff + pip-audit (windows-latest)	59s
pytest (ubuntu-latest)	22s
	5m 34s

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