fix: use truncateId consistently for all user identifiers in logs

fix: use truncateId consistently for all user identifiers in logs

Replace 16 bare idTag/identifier.value references and 4 manual
substring(0,8) truncations with truncateId() across OCPP 1.6
ResponseService, IncomingRequestService, auth adapters, strategies,
and helpers.

User identifiers (RFID tags, auth tokens) are now consistently
truncated in all log output to prevent sensitive data exposure.