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/Common/Dto/Signature.cs

@@ -49,7 +49,7 @@ public sealed record Signature
     public string? Position
     {
         get => _position;
-        init => _position = string.IsNullOrWhiteSpace(value) ? value : null;
+        init => _position = string.IsNullOrWhiteSpace(value) ? null : value;
     }
 
     /// <summary>
@@ -62,4 +62,4 @@ public sealed record Signature
     /// <b>Example:</b> "Berlin" ? rendered as "Berlin, 26.01.2025"
     /// </summary>
     public required string Place { get; init; }
-}
+}

EnvelopeGenerator.Application/DependencyInjection.cs

@@ -65,18 +65,21 @@ public static class DependencyInjection
             cfg.AddBehavior<IPipelineBehavior<SigningCommand, Unit>, EnvelopeReceiverResolutionBehavior>();
             
             // 1. AnnotationBehavior - Saves annotations (executes second)
+            cfg.AddBehavior<IPipelineBehavior<SigningCommand, Unit>, SaveSignatureBehavior>();
+
+            // 2. AnnotationBehavior - Saves annotations for legacy web flow
             cfg.AddBehavior<IPipelineBehavior<SigningCommand, Unit>, AnnotationBehavior>();
             
-            // 2. DocStatusBehavior - Creates document status (executes third)
+            // 3. DocStatusBehavior - Creates document status
             cfg.AddBehavior<IPipelineBehavior<SigningCommand, Unit>, DocStatusBehavior>();
 
-            // 3. HistoryBehavior - Records history (executes fourth)
+            // 4. HistoryBehavior - Records history
             cfg.AddBehavior<IPipelineBehavior<SigningCommand, Unit>, HistoryBehavior>();
             
-            // 4. SendSignedMailBehavior - Sends notification email (executes LAST, only if all previous succeed)
+            // 5. SendSignedMailBehavior - Sends notification email (executes LAST)
             cfg.AddBehavior<IPipelineBehavior<SigningCommand, Unit>, SendSignedMailBehavior>();
         });
 
         return services;
     }
-}
+}

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));

EnvelopeGenerator.Application/DocReceiverElements/Behaviors/SaveSignatureBehavior.cs

@@ -50,8 +50,8 @@ public class SaveSignatureBehavior : IPipelineBehavior<SigningCommand, Unit>
             throw new BadRequestException($"Signatures are required for saving signature behavior.");
 
         var elements = await _elementRepo
-            .Where(e => e.Document.EnvelopeId == request.Envelope.Id)
-            .Where(e => e.ReceiverId == request.Receiver.Id)
+            .Where(e => e.Document.EnvelopeId == request.EnvelopeReceiver.EnvelopeId)
+            .Where(e => e.ReceiverId == request.EnvelopeReceiver.ReceiverId)
             .ToListAsync(cancel);
 
         foreach (var element in elements)