- Add migrations 007-010 for system config, operators, sessions, audit_log
- Implement argon2id password hashing via argon2-cffi
- Implement session-based authentication with database-stored tokens
- Add SetupGateMiddleware to redirect to /setup until first operator created
- Add SessionMiddleware to load session from cookie and attach operator
- Create /setup, /login, /logout, /change-password routes with CSRF protection
- Add periodic session cleanup task (hourly)
- Add audit logging for auth events
- Update systemd unit with EnvironmentFile for /etc/central/central.env
- Add comprehensive tests for auth, middleware, and audit modules
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
