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/src/JdeScoping.Core/Models/Auth/LoginResultModel.cs

@@ -1,4 +1,4 @@
-using JdeScoping.Core.Models;
+using JdeScoping.Core.ApiContracts.Auth;
 
 namespace JdeScoping.Core.Models.Auth;
 
@@ -11,4 +11,4 @@ namespace JdeScoping.Core.Models.Auth;
 public record LoginResultModel(
     bool Success,
     string? ErrorMessage,
-    UserInfo? User);
+    UserInfoDto? User);

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

@@ -1,35 +0,0 @@
-namespace JdeScoping.Core.Models.Infrastructure;
-
-/// <summary>
-/// Database column specification
-/// </summary>
-public class ColumnSpec
-{
-    /// <summary>
-    /// Column name
-    /// </summary>
-    public string Name { get; set; } = string.Empty;
-
-    /// <summary>
-    /// Column definition (SQL type and constraints)
-    /// </summary>
-    public string Definition { get; set; } = string.Empty;
-
-    /// <summary>
-    /// Default constructor
-    /// </summary>
-    public ColumnSpec()
-    {
-    }
-
-    /// <summary>
-    /// Constructor with name and definition
-    /// </summary>
-    /// <param name="name">Column name</param>
-    /// <param name="definition">Column definition</param>
-    public ColumnSpec(string name, string definition)
-    {
-        Name = name;
-        Definition = definition;
-    }
-}

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

@@ -1,83 +0,0 @@
-namespace JdeScoping.Core.Models.Infrastructure;
-
-/// <summary>
-/// Database table specification for dynamic SQL generation
-/// </summary>
-public class TableSpec
-{
-    /// <summary>
-    /// Table name
-    /// </summary>
-    public string Name { get; set; } = string.Empty;
-
-    /// <summary>
-    /// Temporary table name (computed as # + Name)
-    /// </summary>
-    public string TempTableName => $"#{Name}";
-
-    /// <summary>
-    /// Table columns
-    /// </summary>
-    public List<ColumnSpec> Columns { get; set; } = [];
-
-    /// <summary>
-    /// Table columns that form the primary key
-    /// </summary>
-    public List<ColumnSpec> PrimaryKey { get; set; } = [];
-
-    /// <summary>
-    /// Default constructor
-    /// </summary>
-    public TableSpec()
-    {
-    }
-
-    /// <summary>
-    /// Constructor with table name
-    /// </summary>
-    /// <param name="name">Table name</param>
-    public TableSpec(string name)
-    {
-        Name = name;
-    }
-
-    /// <summary>
-    /// Generates SQL for creating an index on the primary key (stub)
-    /// </summary>
-    /// <returns>SQL CREATE INDEX statement</returns>
-    public string GenerateIndex()
-    {
-        // Stub implementation - to be expanded based on spec
-        return string.Empty;
-    }
-
-    /// <summary>
-    /// Generates SQL for dropping the table (stub)
-    /// </summary>
-    /// <returns>SQL DROP TABLE statement</returns>
-    public string GenerateDrop()
-    {
-        // Stub implementation - to be expanded based on spec
-        return string.Empty;
-    }
-
-    /// <summary>
-    /// Generates SQL for creating the table (stub)
-    /// </summary>
-    /// <returns>SQL CREATE TABLE statement</returns>
-    public string GenerateCreate()
-    {
-        // Stub implementation - to be expanded based on spec
-        return string.Empty;
-    }
-
-    /// <summary>
-    /// Gets a column specification by name (stub)
-    /// </summary>
-    /// <param name="columnName">Name of column to find</param>
-    /// <returns>ColumnSpec or null if not found</returns>
-    public ColumnSpec? GetColumn(string columnName)
-    {
-        return Columns.Find(c => c.Name == columnName);
-    }
-}

NEW/src/JdeScoping.Core/Models/Inventory/LotLocation.cs

@@ -1,32 +0,0 @@
-namespace JdeScoping.Core.Models.Inventory;
-
-/// <summary>
-/// JDE lot location entity
-/// </summary>
-public class LotLocation
-{
-    /// <summary>
-    /// Lot unique number
-    /// </summary>
-    public string LotNumber { get; set; } = string.Empty;
-
-    /// <summary>
-    /// Short item number
-    /// </summary>
-    public long ShortItemNumber { get; set; }
-
-    /// <summary>
-    /// Business unit unique code
-    /// </summary>
-    public string BranchCode { get; set; } = string.Empty;
-
-    /// <summary>
-    /// Location code where lot is located
-    /// </summary>
-    public string Location { get; set; } = string.Empty;
-
-    /// <summary>
-    /// Timestamp of last update to record
-    /// </summary>
-    public DateTime? LastUpdateDt { get; set; }
-}