the pr content:

  1. supports ZhiPuAI more models, including visual model (GLM-4V)
  2. change default chat model to GLM-4-Air, stronger reasoning ability and the same price as GLM-3-Turbo
  3. more unit tests, including media chat
  4. modify relevant documents

fix issue #854

Comment From: markpollack

merged in f989dfe06e4bc1e4a1cf731743a9bb5da98718e9

:hugs: