Fixes:
- Fixed is_auth_enabled() returning None instead of False when setting doesn't exist (in both auth.py and routes/auth.py)
- Fixed get_current_user() crashing when credentials is None
- Added missing async_session patch in conftest.py for auth tests
Backup/Restore - Added Users Support
- Added include_users parameter to backup export
- Users are exported with username, role, and is_active (passwords excluded for security)
- Restore creates users with temporary passwords that must be changed
Backend Tests - 16 New Auth Tests
- test_auth_api.py with tests for:
- Auth status endpoint
- Auth setup (enable/disable)
- Login flow (success, invalid credentials, auth disabled)
- /me endpoint with/without token
- User management (list, create, update, delete)
- Auth disable
Frontend Tests - 6 New Login Tests
- LoginPage.test.tsx with tests for:
- Form rendering
- Input validation
- Login submission
- Loading states
Documentation Updates
- CHANGELOG.md/README.md: Added authentication feature description
- Website (features.html): Added new "Optional Authentication" section
- Wiki: Created authentication.md with full documentation
- Wiki index: Added authentication to features list
