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.Client/Services/RefreshStatusService.cs

@@ -1,5 +1,5 @@
 using System.Net.Http.Json;
-using JdeScoping.Client.Models;
+using JdeScoping.Core.Models.Infrastructure;
 
 namespace JdeScoping.Client.Services;
 
@@ -16,13 +16,13 @@ public class RefreshStatusService : IRefreshStatusService
         _httpClient = httpClient;
     }
 
-    public async Task<List<DataUpdateViewModel>> GetRefreshStatusAsync(DateTime minDt, DateTime maxDt)
+    public async Task<List<DataUpdateDto>> GetRefreshStatusAsync(DateTime minDt, DateTime maxDt)
     {
         try
         {
             var minDtStr = minDt.ToString("yyyy-MM-dd");
             var maxDtStr = maxDt.ToString("yyyy-MM-dd");
-            var result = await _httpClient.GetFromJsonAsync<List<DataUpdateViewModel>>(
+            var result = await _httpClient.GetFromJsonAsync<List<DataUpdateDto>>(
                 $"api/refresh-status?minDT={minDtStr}&maxDT={maxDtStr}");
             return result ?? [];
         }