chore: remove unused MessageTypeName.Notification

Author: yileicn

src/Infrastructure/BotSharp.Abstraction/Conversations/Enums/MessageTypeName.cs

@@ -3,7 +3,6 @@ namespace BotSharp.Abstraction.Conversations.Enums;
 public static class MessageTypeName
 {
     public const string Plain = "plain";
-    public const string Notification = "notification";
     public const string FunctionCall = "function";
     public const string Audio = "audio";
     public const string Error = "error";

src/Infrastructure/BotSharp.Core/Conversations/Services/ConversationService.Summary.cs

@@ -1,4 +1,3 @@
-using BotSharp.Abstraction.Conversations.Enums;
 using BotSharp.Abstraction.MLTasks;
 using BotSharp.Abstraction.Models;
 using BotSharp.Abstraction.Settings;
@@ -24,7 +23,6 @@ public async Task<string> GetConversationSummary(ConversationSummaryModel model)
 
             if (dialogs.IsNullOrEmpty()) continue;
 
-            dialogs = dialogs.Where(x => x.MessageType != MessageTypeName.Notification).ToList();
             var content = GetConversationContent(dialogs);
             if (string.IsNullOrWhiteSpace(content)) continue;