Lukas ea4c7c2f85 Implement login endpoint rate limiting (TASK-007) ...

- Add in-memory rate limiter with per-IP deque tracking of attempt timestamps
- Limit login attempts to 5 per 60 seconds per IP, return 429 on excess
- Add Retry-After header to rate limit responses
- Implement IP extraction utility with proxy trust validation (prevent X-Forwarded-For spoofing)
- Integrate rate limiter into auth router and dependencies
- Add 10-second asyncio.sleep on failed login attempts to further slow brute-force
- Add comprehensive tests for rate limiting (9 new tests, all passing)
- Update Features.md to document login rate limiting
- Update Backend-Development.md with rate limiting conventions and design patterns
- Fix test infrastructure issues: update password to meet complexity requirements
- Fix TestValidateSession tests to use Bearer token authentication
- All tests passing: 23 auth tests + full test suite coverage

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

2026-04-26 12:40:52 +02:00

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