refactor(core): reorganize DTOs into Models and ViewModels folders

Move DTOs from ApiContracts to appropriate locations:
- SignalR DTOs → ViewModels (renamed Dto→ViewModel suffix)
- Pipeline DTOs → Models/Pipelines
- UserInfoDto → Models/Auth
- DataUpdateDto → Models/Infrastructure

NEW/src/JdeScoping.Core/Models/Infrastructure/DataUpdateDto.cs

@@ -0,0 +1,25 @@
+namespace JdeScoping.Core.Models.Infrastructure;
+
+/// <summary>
+/// DTO for data refresh/sync status display.
+/// Aggregates record counts from multiple table updates into a single row.
+/// </summary>
+public class DataUpdateDto
+{
+    public DateTime StartDt { get; set; }
+    public DateTime? EndDt { get; set; }
+
+    public int BranchRecords { get; set; }
+    public int ProfitCenterRecords { get; set; }
+    public int WorkCenterRecords { get; set; }
+    public int OrgHierarchyRecords { get; set; }
+    public int StatusCodeRecords { get; set; }
+    public int UserRecords { get; set; }
+    public int ItemRecords { get; set; }
+    public int LotRecords { get; set; }
+    public int WorkOrderRecords { get; set; }
+    public int WorkOrderStepRecords { get; set; }
+    public int WorkOrderComponentRecords { get; set; }
+
+    public bool WasSuccessful { get; set; }
+}