feat(02-02): auth API endpoints + security hardening + Python 3.9 compat
- backend/api/auth.py: register, login (TOTP+backup), refresh, logout,
me, change-password; per-account Redis rate limit; HIBP check
- backend/main.py: Origin validation middleware, CSP headers middleware,
CORS locked to settings.cors_origins, Redis lifespan (app.state.redis),
admin bootstrap, auth router included, slowapi SlowAPIMiddleware
- backend/services/email.py: already created in Plan 01 (verified exists)
- Python 3.9 compat: fixed match statement in ai/__init__.py,
str|None union syntax in openai_provider.py, api/documents.py,
api/topics.py, api/settings.py, services/classifier.py
All 17 tests in test_auth_api.py pass.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
curo1305
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