refactor: standardize audit logging for ISO27001 compliance

gatehouse_app/services/zerotier_reconciliation_service.py

@@ -16,6 +16,7 @@ from gatehouse_app.services import zerotier_api_service as zt
 from gatehouse_app.utils.constants import (
     ActivationEndReason,
     ApprovalState,
+    AuditAction,
 )
 
 logger = logging.getLogger(__name__)
@@ -452,7 +453,7 @@ def _expire_session(session: ActivationSession) -> None:
 
     from gatehouse_app.services.audit_service import AuditService
     AuditService.log_action(
-        action="zt.activation.expired",
+        action=AuditAction.ZT_ACTIVATION_EXPIRED,
         user_id=session.user_id,
         organization_id=session.organization_id,
         resource_type="activation_session",