Add envelope receiver access code request feature

Introduced a feature to allow envelope receivers to request an
access code via email on the login page.

- Added `OnInitializedAsync` in `LoginReceiverPage.razor` to
  trigger access code requests using `AuthService`.
- Implemented `RequestEnvelopeReceiverAccessCodeAsync` in
  `AuthService.cs` to handle API calls for access code requests.
- Added a new endpoint in `AuthController` to process access
  code requests, including validation, history recording, and
  email dispatching.
- Registered `IEnvelopeMailService` and `AddDispatcher` in
  `Program.cs` to support email dispatch and database operations.
- Refactored `AuthController` constructor for readability and
  added necessary `using` directives.
- Improved logging and error handling for better traceability
  and robustness.

These changes ensure a seamless and secure process for envelope
receivers to request access codes, enhancing the user experience.

EnvelopeGenerator.Server/EnvelopeGenerator.Server/Program.cs

@@ -25,6 +25,7 @@ using NLog.Web;
 using NLog;
 using DigitalData.Auth.Claims;
 using EnvelopeGenerator.Server;
+using DigitalData.EmailProfilerDispatcher;
 
 var logger = LogManager.Setup().LoadConfigurationFromAppSettings().GetCurrentClassLogger();
 logger.Info("EnvelopeGenerator.Server logging initialized!");
@@ -323,6 +324,8 @@ try
         .AddEnvelopeGeneratorServices(config);
 #pragma warning restore CS0618
 
+    builder.Services.AddDispatcher<EGDbContext>();
+
     // User Preferences (theme, dark mode, grid layouts — stored in TBDD_CACHE)
     // Registration handled by Infrastructure DependencyInjection (AddEnvelopeGeneratorInfrastructureServices)
 
@@ -346,6 +349,7 @@ try
     builder.Services.AddScoped<EnvelopeReceiverService>();
     builder.Services.AddScoped<SignatureService>();
     builder.Services.AddScoped<SignatureCacheService>();
+    builder.Services.AddScoped<EnvelopeGenerator.Application.Common.Interfaces.Services.IEnvelopeMailService, EnvelopeGenerator.Application.Services.EnvelopeMailService>();
     builder.Services.AddSingleton<AppVersionService>();
 
     // EnvelopeService with HttpClient factory (for SSR scenarios)