:gem: [Feature] Enable get models of chat.openai.com

:recycle: [Refactor] Use official chat_template to replace mannual parses for several models, and remove unused message split functions

:gem: [Feature] Support new model: openchat-3.5-0106

:gem: [Feature] ChatAPIApp: New /readme route

:zap: [Enhance] Auto calculate max_tokens if not set

:gem: [Feature] Enable Docker deployment, and add requirements