refactor: remove unused classes and consolidate ViewModels in Core

Remove 9 unused types from Core (duplicate extension classes, TableSpec, ColumnSpec, LotLocation), move ComponentLotViewModel and OperatorViewModel from Client to Core, and refactor DataSync.Dev to use pipeline-based configuration. Fix Login.razor to use UserInfoDto directly.

NEW/tests/JdeScoping.Client.Tests/Services/AuthApiClientTests.cs

@@ -2,8 +2,8 @@ using System.Net;
 using System.Text.Json;
 using JdeScoping.Client.Services;
 using JdeScoping.Core.ApiContracts;
+using JdeScoping.Core.ApiContracts.Auth;
 using JdeScoping.Core.ApiContracts.Results;
-using JdeScoping.Core.Models;
 using JdeScoping.Core.Models.Auth;
 using RichardSzalay.MockHttp;
 using Shouldly;
@@ -70,7 +70,7 @@ public class AuthApiClientTests
     public async Task GetCurrentUserAsync_CallsCorrectRoute()
     {
         // Arrange
-        var user = new UserInfo { Username = "testuser", FirstName = "Test", LastName = "User" };
+        var user = new UserInfoDto { Username = "testuser", FirstName = "Test", LastName = "User" };
         var request = _mockHttp.Expect(HttpMethod.Get, $"http://localhost/{ApiRoutes.Auth.Me}")
             .Respond("application/json", JsonSerializer.Serialize(user));
 
@@ -103,7 +103,7 @@ public class AuthApiClientTests
     public async Task LoginAsync_Success_ReturnsLoginResult()
     {
         // Arrange
-        var user = new UserInfo { Username = "testuser", FirstName = "Test", LastName = "User" };
+        var user = new UserInfoDto { Username = "testuser", FirstName = "Test", LastName = "User" };
         var loginResult = new LoginResultModel(true, null, user);
         _mockHttp.When(HttpMethod.Post, "*")
             .Respond("application/json", JsonSerializer.Serialize(loginResult));
@@ -135,7 +135,7 @@ public class AuthApiClientTests
     public async Task GetCurrentUserAsync_Success_ReturnsUserInfo()
     {
         // Arrange
-        var userInfo = new UserInfo { Username = "testuser", FirstName = "Test", LastName = "User" };
+        var userInfo = new UserInfoDto { Username = "testuser", FirstName = "Test", LastName = "User" };
         _mockHttp.When(HttpMethod.Get, "*")
             .Respond("application/json", JsonSerializer.Serialize(userInfo));