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.Server/EnvelopeGenerator.Server.Client/Models/SignatureSubmitDto.cs

@@ -0,0 +1,10 @@
+namespace EnvelopeGenerator.Server.Client.Models;
+
+public sealed record SignatureSubmitDto
+{
+    public required int Id { get; init; }
+    public required string DataUrl { get; init; }
+    public required string FullName { get; init; }
+    public string? Position { get; init; }
+    public required string Place { get; init; }
+}

EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Services/SignatureService.cs

@@ -1,6 +1,7 @@
 using System.Net.Http;
 using System.Net.Http.Json;
 using System.Text.Json;
+using EnvelopeGenerator.Application.Common.Dto;
 using EnvelopeGenerator.Server.Client.Models;
 
 namespace EnvelopeGenerator.Server.Client.Services;
@@ -21,4 +22,32 @@ public class SignatureService(IHttpClientFactory httpClientFactory)
         var result = await response.Content.ReadFromJsonAsync<List<SignatureDto>>(_jsonOptions, cancel);
         return result ?? [];
     }
+
+    public async Task SubmitAsync(string envelopeKey, IEnumerable<SignatureSubmitDto> signatures, CancellationToken cancel = default)
+    {
+        using var http = httpClientFactory.CreateClient("EnvelopeGenerator.Server");
+
+        var payload = signatures
+            .Select(signature => new Signature
+            {
+                Id = signature.Id,
+                DataUrl = signature.DataUrl,
+                FullName = signature.FullName,
+                Position = signature.Position,
+                Place = signature.Place
+            })
+            .ToList();
+
+        var response = await http.PostAsJsonAsync(
+            $"/api/Signature/submit/{Uri.EscapeDataString(envelopeKey)}",
+            payload,
+            cancel);
+
+        if (!response.IsSuccessStatusCode)
+        {
+            var body = await response.Content.ReadAsStringAsync(cancel);
+            throw new HttpRequestException(
+                $"Failed to submit signature for envelope {envelopeKey}: {(int)response.StatusCode} {response.StatusCode} - {body}");
+        }
+    }
 }