Tests that call POST /api/counter/increment now explicitly request
the mock_enqueue_job fixture. This prevents the mock from masking
issues in other tests that don't need it.
- Add RandomNumberOutcomeResponse schema to schemas.py
- Add GET /api/audit/random-jobs endpoint to routes/audit.py
- Returns list of outcomes (newest first, no pagination)
- Requires VIEW_AUDIT permission
- Add tests: admin can access, regular user forbidden, unauthenticated 401
- Add ruff as dev dependency
- Configure ruff in pyproject.toml with strict 88-char line limit
- Ignore B008 (FastAPI Depends pattern is standard)
- Allow longer lines in tests for readability
- Fix all lint issues in source files
- Add Makefile targets: lint-backend, format-backend, fix-backend
