Dify Agent mode doesn't work😔

[uezo]

DifyService works with Dify Chatbot, but doesn't work (says nothing) with Dify Agent mode.

DifyService handles the message event, but Dify Agent returns agent_message. This difference causes the avatar to remain silent.
https://github.com/uezo/ChatdollKit/blob/master/Scripts/LLM/Dify/DifyService.cs#L300