feat(etl): add DI registration for ETL pipeline

NEW/src/JdeScoping.DataSync/Etl/EtlServiceCollectionExtensions.cs

@@ -0,0 +1,21 @@
+using JdeScoping.DataSync.Etl.Pipeline;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace JdeScoping.DataSync.Etl;
+
+/// <summary>
+/// Extension methods for registering ETL pipeline services.
+/// </summary>
+public static class EtlServiceCollectionExtensions
+{
+    /// <summary>
+    /// Adds ETL pipeline services to the service collection.
+    /// </summary>
+    public static IServiceCollection AddEtlPipeline(this IServiceCollection services)
+    {
+        // Register the builder as transient so each request gets a fresh builder
+        services.AddTransient<EtlPipelineBuilder>();
+
+        return services;
+    }
+}