chore: 🔨 事件发布器接口通道数量

[skip ci]

src/backend/NetAdmin/NetAdmin.Infrastructure/EventBus/DefaultEventPublisher.cs

@@ -28,6 +28,9 @@ public sealed class DefaultEventPublisher : IEventPublisher
             }, App.EffectiveTypes.Where(x => typeof(IEventSubscriber).IsAssignableFrom(x) && x.IsClass && !x.IsAbstract).SelectMany(x => x.GetMethods(BindingFlags.Instance | BindingFlags.Public).Where(y => y.IsDefined(typeof(EventSubscribeAttribute)))).ToList());
     }
 
+    /// <inheritdoc />
+    public int ChannelCount => _eventChannel.Reader.Count;
+
     /// <inheritdoc />
     public async Task PublishAsync<T>(IEventData<T> eventData)
     {

src/backend/NetAdmin/NetAdmin.Infrastructure/EventBus/IEventPublisher.cs

@@ -5,6 +5,11 @@ namespace NetAdmin.Infrastructure.EventBus;
 /// </summary>
 public interface IEventPublisher
 {
+    /// <summary>
+    ///     通道数量
+    /// </summary>
+    int ChannelCount { get; }
+
     /// <summary>
     ///     发布一条消息
     /// </summary>