fix(auth): address audit findings in OCPP auth abstraction layer

fix(auth): address audit findings in OCPP auth abstraction layer

- Read AuthCtrlr.LocalAuthorizeOffline variable instead of hardcoding true
- Delegate testConnectivity() to actual adapter availability checks
- Remove duplicate mapOCPP20AuthStatus(), use canonical mapOCPP20AuthorizationStatus
- Map strategies by name instead of fragile priority numbers
- Make connectorId truly optional in OCPP20AuthAdapter.authorizeRemote()
- Use ES2022 Error cause chain in AuthenticationError