用于 ViewModels(或任何对象)之间解耦通信的 CommunityToolkit.Mvvm Messenger 发布/订阅。涵盖 WeakReferenceMessenger 与 StrongReferenceMessenger、IRecipient、RequestMessage / AsyncRequestMessage / CollectionRequestMessage、ValueChangedMessage、channels(tokens)以及 ObservableRecipient 激活生命周期。适用于 WPF、WinUI 3、.NET MAUI、Uno 和 Av