feat: finalize core modules and gateway

src/Modules/TakeoutSaaS.Module.Messaging/Abstractions/IMessagePublisher.cs

@@ -0,0 +1,15 @@
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace TakeoutSaaS.Module.Messaging.Abstractions;
+
+/// <summary>
+/// 消息发布抽象。
+/// </summary>
+public interface IMessagePublisher
+{
+    /// <summary>
+    /// 发布消息到指定路由键。
+    /// </summary>
+    Task PublishAsync<T>(string routingKey, T message, CancellationToken cancellationToken = default);
+}

src/Modules/TakeoutSaaS.Module.Messaging/Abstractions/IMessageSubscriber.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace TakeoutSaaS.Module.Messaging.Abstractions;
+
+/// <summary>
+/// 消息订阅抽象。
+/// </summary>
+public interface IMessageSubscriber : IAsyncDisposable
+{
+    /// <summary>
+    /// 订阅指定队列与路由键，处理后返回是否消费成功。
+    /// </summary>
+    Task SubscribeAsync<T>(string queue, string routingKey, Func<T, CancellationToken, Task<bool>> handler, CancellationToken cancellationToken = default);
+}