feat: record who created join codes and who added each node [CI]

backend/fleet/src/Fleet.Server.Enrollment/FleetEnrollmentService.cs

@@ -80,7 +80,8 @@ public sealed partial class FleetEnrollmentService
             request.NodeVersion,
             nowMs,
             token.Kind,
-            tlsPublicKey);
+            tlsPublicKey,
+            token.CreatedBy);
 
         Result<NodeRecord> created = await _store.CreateNodeAsync(node, ct);
         if (!created.TryGet(out NodeRecord? record, out FleetError? error))