feat(configmanager): add NonMatchBehavior enum and regex properties to TransformerModel

Add configuration model support for the new Regex transformer including:
- NonMatchBehavior enum with JSON string serialization
- ColumnName, Pattern, Replacement, IgnoreCase, NonMatchBehavior properties

NEW/src/Utils/JdeScoping.ConfigManager/Models/PipelineModel.cs

@@ -1,3 +1,5 @@
+using System.Text.Json.Serialization;
+
 namespace JdeScoping.ConfigManager.Models;
 
 /// <summary>
@@ -212,4 +214,43 @@ public class TransformerModel
     /// Gets or sets the output column name for JdeDate transformer.
     /// </summary>
     public string? OutputColumn { get; set; }
+
+    /// <summary>
+    /// Gets or sets the column name for Regex transformer.
+    /// </summary>
+    public string? ColumnName { get; set; }
+
+    /// <summary>
+    /// Gets or sets the regex pattern for Regex transformer.
+    /// </summary>
+    public string? Pattern { get; set; }
+
+    /// <summary>
+    /// Gets or sets the replacement string for Regex transformer (null = Match &amp; Extract mode).
+    /// </summary>
+    public string? Replacement { get; set; }
+
+    /// <summary>
+    /// Gets or sets whether regex matching is case-insensitive.
+    /// </summary>
+    public bool IgnoreCase { get; set; }
+
+    /// <summary>
+    /// Gets or sets the behavior when regex pattern does not match.
+    /// </summary>
+    public NonMatchBehavior NonMatchBehavior { get; set; } = NonMatchBehavior.KeepOriginal;
+}
+
+/// <summary>
+/// Specifies behavior when a regex pattern does not match the input value.
+/// </summary>
+[JsonConverter(typeof(JsonStringEnumConverter))]
+public enum NonMatchBehavior
+{
+    /// <summary>Keep the original value unchanged.</summary>
+    KeepOriginal,
+    /// <summary>Return null/DBNull.</summary>
+    ReturnNull,
+    /// <summary>Return an empty string.</summary>
+    ReturnEmpty
 }