fixed: step mapper to trace ignore workflow

src/Hotline.Application/Mappers/WorkflowMapperConfigs.cs

@@ -44,6 +44,7 @@ public class WorkflowMapperConfigs : IRegister
             ;
 
         config.ForType<WorkflowStep, WorkflowTrace>()
+            .Ignore(d=>d.Workflow)
             .Ignore(d => d.ParentId)
             .Ignore(d => d.TraceType)
             .Map(d => d.StepId, s => s.Id)