Add signature submission feature and pipeline updates

Introduced a new feature for submitting signatures, including
backend and frontend changes. Added `SignatureSubmitDto` and
`SubmitAsync` in `SignatureService` to handle signature data
submission. Implemented a new `Submit` endpoint in
`SignatureController` to validate and process signature payloads.

Updated pipeline behaviors to include `SaveSignatureBehavior`
and adjusted the execution order. Enhanced query logic in
`EnvelopeReceiverResolutionBehavior` and `SaveSignatureBehavior`
to align with the updated data model.

Refactored `EGDbContext` to improve trigger handling and logging.
Updated `ReceiverSignedPage.razor` to integrate `SignatureService`
and handle submission errors gracefully. Adjusted application
URLs in `launchSettings.json` and added new database triggers
in `appsettings.json`.

EnvelopeGenerator.Application/DocReceiverElements/Behaviors/EnvelopeReceiverResolutionBehavior.cs

@@ -43,7 +43,11 @@ public class EnvelopeReceiverResolutionBehavior : IPipelineBehavior<SigningComma
         // If EnvelopeReceiver is not provided, query it from database
         if (request.EnvelopeReceiver is null)
         {
-            var er = await _erRepo.Query.Where(request, notnull: true).SingleOrDefaultAsync(cancellationToken)
+            var er = await _erRepo.Query
+                .Where(request, notnull: true)
+                .Include(x => x.Envelope)
+                .Include(x => x.Receiver)
+                .SingleOrDefaultAsync(cancellationToken)
                 ?? throw new NotFoundException("EnvelopeReceiver not found");
 
             request.SetEnvelopeReceiver(_mapper.Map<EnvelopeReceiverDto>(er));