Move WorkflowsClientExtensions to IWorkflowsClient.cs

Relocated the `WorkflowsClientExtensions` class from `WorkflowsClient.cs` to `IWorkflowsClient.cs` to improve discoverability by defining it alongside the `IWorkflowsClient` interface.

The `InspectSwissQrCodeAsync` extension method was moved as part of this change. Its functionality remains unchanged, as it still opens a `FileStream` for the provided file path and delegates to the `IWorkflowsClient.InspectSwissQrCodeAsync(Stream, bool, CancellationToken)` method.

DocumentService.Client/Clients/WorkflowsClient.cs

@@ -42,32 +42,3 @@ public class WorkflowsClient(IPdfValidationClient validation, ISwissQrCodeClient
         return new SwissQrCodeResult(qrCode, validationResult);
     }
 }
-
-/// <summary>
-/// Convenience extensions for <see cref="IWorkflowsClient"/> that accept a file path as input.
-/// Defined alongside <see cref="WorkflowsClient"/> so they are discoverable without an additional using directive.
-/// </summary>
-public static class WorkflowsClientExtensions
-{
-    /// <summary>
-    /// Validates the PDF at <paramref name="filePath"/> and attempts Swiss QR Code extraction
-    /// in a single call. Opens a <see cref="FileStream"/> and delegates to
-    /// <see cref="IWorkflowsClient.InspectSwissQrCodeAsync(Stream, bool, CancellationToken)"/>.
-    /// </summary>
-    /// <param name="client">The workflows client.</param>
-    /// <param name="filePath">Absolute or relative path to the PDF file.</param>
-    /// <param name="raw">
-    /// <c>false</c> (default) – returns a parsed Bill object.<br/>
-    /// <c>true</c> – returns raw QR text lines without parsing.
-    /// </param>
-    /// <param name="cancellationToken">Cancellation token.</param>
-    public static async Task<SwissQrCodeResult> InspectSwissQrCodeAsync(
-        this IWorkflowsClient client,
-        string filePath,
-        bool raw = false,
-        CancellationToken cancellationToken = default)
-    {
-        using var stream = File.OpenRead(filePath);
-        return await client.InspectSwissQrCodeAsync(stream, raw, cancellationToken);
-    }
-}

DocumentService.Client/Interfaces/IWorkflowsClient.cs

@@ -40,3 +40,32 @@ public interface IWorkflowsClient
         bool raw = false,
         CancellationToken cancellationToken = default);
 }
+
+/// <summary>
+/// Convenience extensions for <see cref="IWorkflowsClient"/> that accept a file path as input.
+/// Defined alongside <see cref="IWorkflowsClient"/> so they are discoverable without an additional using directive.
+/// </summary>
+public static class WorkflowsClientExtensions
+{
+    /// <summary>
+    /// Validates the PDF at <paramref name="filePath"/> and attempts Swiss QR Code extraction
+    /// in a single call. Opens a <see cref="FileStream"/> and delegates to
+    /// <see cref="IWorkflowsClient.InspectSwissQrCodeAsync(Stream, bool, CancellationToken)"/>.
+    /// </summary>
+    /// <param name="client">The workflows client.</param>
+    /// <param name="filePath">Absolute or relative path to the PDF file.</param>
+    /// <param name="raw">
+    /// <c>false</c> (default) – returns a parsed Bill object.<br/>
+    /// <c>true</c> – returns raw QR text lines without parsing.
+    /// </param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    public static async Task<SwissQrCodeResult> InspectSwissQrCodeAsync(
+        this IWorkflowsClient client,
+        string filePath,
+        bool raw = false,
+        CancellationToken cancellationToken = default)
+    {
+        using var stream = File.OpenRead(filePath);
+        return await client.InspectSwissQrCodeAsync(stream, raw, cancellationToken);
+    }
+}