Cleaned up request acks. Added internal service bus for internal messaging.

Hermes/Socket/Requests/UpdateDefaultTTSVoiceAck.cs

@@ -0,0 +1,37 @@
+using Serilog;
+
+namespace TwitchChatTTS.Hermes.Socket.Requests
+{
+    public class UpdateDefaultTTSVoiceAck : IRequestAck
+    {
+        public string Name => "update_default_tts_voice";
+        private readonly User _user;
+        private readonly ILogger _logger;
+
+        public UpdateDefaultTTSVoiceAck(User user, ILogger logger)
+        {
+            _user = user;
+            _logger = logger;
+        }
+
+        public void Acknowledge(string requestId, string json, IDictionary<string, object>? requestData)
+        {
+            if (requestData == null)
+            {
+                _logger.Warning("Request data is null.");
+                return;
+            }
+
+            if (requestData.TryGetValue("voice", out object? voice) == true && voice is string v)
+            {
+                if (_user.VoicesEnabled.Contains(v))
+                {
+                    _user.DefaultTTSVoice = v;
+                    _logger.Information($"Default TTS voice was changed to '{v}'.");
+                    return;
+                }
+            }
+            _logger.Warning("Failed to update default TTS voice via request.");
+        }
+    }
+}