feat: finalize core modules and gateway

src/Application/TakeoutSaaS.Application/Messaging/Extensions/MessagingServiceCollectionExtensions.cs

@@ -0,0 +1,20 @@
+using Microsoft.Extensions.DependencyInjection;
+using TakeoutSaaS.Application.Messaging.Abstractions;
+using TakeoutSaaS.Application.Messaging.Services;
+
+namespace TakeoutSaaS.Application.Messaging.Extensions;
+
+/// <summary>
+/// 消息模块应用层注册。
+/// </summary>
+public static class MessagingServiceCollectionExtensions
+{
+    /// <summary>
+    /// 注册事件发布器。
+    /// </summary>
+    public static IServiceCollection AddMessagingApplication(this IServiceCollection services)
+    {
+        services.AddScoped<IEventPublisher, EventPublisher>();
+        return services;
+    }
+}