Refactor configuration handling

Refactored `MessagingServiceApplicationConfiguration` to simplify the tracking of the LuckyPennySoft license key configuration by replacing the `_configured` tuple with a boolean. Removed email account configuration methods from this class.

Updated `MessagingServiceInfrastructureConfiguration` to introduce a new `_configured` tuple for tracking `RabbitMqConnectionFactory` and `EmailAccounts` configurations. Added methods for configuring email accounts and updated the `EnsureRabbitMqConnectionFactoryAdded` method to include email account checks.

Changed the namespace of `EmailAccountsOptions.cs` to `DigitalData.MessagingService.Infrastructure.Options`.

Modified `Program.cs` to include email account configuration in the infrastructure setup.

Added new files `DependencyInjectionExtensions.cs` and `MessagingServiceConfiguration.cs` as placeholders for future extensions, wrapped in `#if NET` directives.

Removed an `<ItemGroup>` from `DigitalData.MessagingService.Infrastructure.csproj` and updated `DigitalData.MessagingService.Client.csproj` for XML compliance.

src/presentation/DigitalData.MessagingService.API/Program.cs

@@ -68,7 +68,9 @@ try
     builder.Services.AddMessagingServiceApplication(builder.Configuration);
 
     // Register Infrastructure layer (RabbitMQ, Repositories, etc.)
-    builder.Services.AddInfrastructure(cfg => cfg.AddRabbitMqConnectionFactory(builder.Configuration));
+    builder.Services.AddInfrastructure(cfg => cfg
+        .AddRabbitMqConnectionFactory(builder.Configuration)
+        .ConfigureEmailAccounts(builder.Configuration));
 
     // Health checks — each check corresponds to a singleton registered in the Infrastructure layer
     builder.Services.AddHealthChecks()

src/presentation/DigitalData.MessagingService.Client/DependencyInjection/DependencyInjectionExtensions.cs

@@ -0,0 +1,10 @@
+#if NET
+namespace DigitalData.MessagingService.Client.DependencyInjection;
+
+/// <summary>
+/// 
+/// </summary>
+public static class DependencyInjectionExtensions
+{
+}
+#endif

src/presentation/DigitalData.MessagingService.Client/DependencyInjection/MessagingServiceConfiguration.cs

@@ -0,0 +1,10 @@
+#if NET
+namespace DigitalData.MessagingService.Client.DependencyInjection;
+
+/// <summary>
+/// 
+/// </summary>
+public class MessagingServiceConfiguration
+{
+}
+#endif

src/presentation/DigitalData.MessagingService.Client/DigitalData.MessagingService.Client.csproj

@@ -61,7 +61,7 @@
 
   <Target Name="EmbedProjectReferences" DependsOnTargets="ResolveReferences">
     <ItemGroup>
-      <BuildOutputInPackage Include="@(ReferenceCopyLocalPaths->WithMetadataValue('ReferenceSourceTarget','ProjectReference'))" />
+      <BuildOutputInPackage Include="@(ReferenceCopyLocalPaths-&gt;WithMetadataValue('ReferenceSourceTarget','ProjectReference'))" />
     </ItemGroup>
   </Target>