feat(infrastructure): Add RabbitMQ Command Bus integration

- Add RabbitMQ.Client 7.2.1, Microsoft.Extensions.Hosting 10.0.9
- Implement ICommandPublisher interface for async command publishing
- Create RabbitMqCommandPublisher with persistent message delivery
- Create RabbitMqCommandConsumer BackgroundService for command processing
- Add RabbitMqConfiguration with appsettings.json binding
- Configure Infrastructure DI with RabbitMQ services
- Update Program.cs to support appsettings.Secrets.json
- Server: 172.24.12.56:5672, Exchange: emailprofiler.commands

src/DigitalData.EmailProfiler.Infrastructure/DependencyInjection.cs

@@ -0,0 +1,32 @@
+using DigitalData.EmailProfiler.Application.Common.Interfaces;
+using DigitalData.EmailProfiler.Infrastructure.Messaging;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace DigitalData.EmailProfiler.Infrastructure;
+
+/// <summary>
+/// Dependency injection configuration for Infrastructure layer
+/// </summary>
+public static class DependencyInjection
+{
+    /// <summary>
+    /// Adds Infrastructure layer services to the DI container
+    /// </summary>
+    public static IServiceCollection AddInfrastructure(
+        this IServiceCollection services,
+        IConfiguration configuration)
+    {
+        // Register RabbitMQ configuration
+        services.Configure<RabbitMqConfiguration>(
+            configuration.GetSection(RabbitMqConfiguration.SectionName));
+
+        // Register RabbitMQ command publisher
+        services.AddSingleton<ICommandPublisher, RabbitMqCommandPublisher>();
+
+        // Register RabbitMQ command consumer as hosted service
+        services.AddHostedService<RabbitMqCommandConsumer>();
+
+        return services;
+    }
+}