- Add broker-related configuration classes (`broker_url`, `public_broker_url`, `auth_mode`, `shared_secret`) to support edge gateway functionality.
- Enhance `SelfserveRoute` with routes for managing self-serve wash sessions, including session listing, detail retrieval, and forced lane stop.
- Update unit tests to validate new configuration handling, session routes, and OpenAPI endpoint coverage.
- Include default environment variables for broker settings in `docker-compose.example.yml`.
Transitioned from obsolete gateway object classes (`edge_gateway_shell_action_jobs_o`, `edge_gateway_shell_events_o`, `edge_gateway_shell_sessions_o`, `edge_gateway_update_jobs_o`) to the new agent implementation (`edge-gateway-agent/agent.php`).