feat(DocSignedNotification): replace Annotations with PsPdfKitAnnotation in DocSignedNotification

- Introduced new record `PsPdfKitAnnotation` to encapsulate both Instant and Structured annotation data
- Updated `DocSignedNotification` to use `PsPdfKitAnnotation` instead of `ExpandoObject Annotations`
- Modified extension methods to accept and map `PsPdfKitAnnotation`
- Added reference to `EnvelopeGenerator.Application.Annotations.Commands` for `CreateAnnotationCommand`

EnvelopeGenerator.Web/Controllers/AnnotationController.cs

@@ -44,7 +44,7 @@ public class AnnotationController : ControllerBase
 
     [Authorize(Roles = ReceiverRole.FullyAuth)]
     [HttpPost]
-    public async Task<IActionResult> CreateOrUpdate([FromBody] ExpandoObject annotations, CancellationToken cancel = default)
+    public async Task<IActionResult> CreateOrUpdate([FromBody] PsPdfKitAnnotation psPdfKitAnnotation, CancellationToken cancel = default)
     {
         // get claims
         var signature = User.GetAuthReceiverSignature();
@@ -62,7 +62,7 @@ public class AnnotationController : ControllerBase
 
         var docSignedNotification = await _mediator
             .ReadEnvelopeReceiverAsync(uuid, signature, cancel)
-            .ToDocSignedNotification(annotations)
+            .ToDocSignedNotification(psPdfKitAnnotation)
             ?? throw new NotFoundException("Envelope receiver is not found.");
 
         await _mediator.Publish(docSignedNotification, cancel);