Переместил ChatHub в слой Application

AMessanger.Application/Hubs/ChatHub.cs

@@ -0,0 +1,14 @@
+using AMessanger.Core.Models;
+using Microsoft.AspNetCore.SignalR;
+using Microsoft.Extensions.Logging;
+
+namespace AMessanger.Application.Hubs;
+
+public class ChatHub(ILogger<ChatHub> logger) : Hub
+{
+    public async Task SendMessage(Message message)
+    {
+        logger.LogInformation($"{message.UserName}: {message.Content}");
+        await Clients.All.SendAsync("ReceiveMessage", message);
+    }
+}