* feat(install): enhance installation script functionality - Add help information display feature - Support custom GitHub proxy URL - Add --no-gh-proxy option to disable GitHub proxy - Optimize error messages and command prompts - Fix typo (Commend -> Command) * docs: update installation script documentation --------- Co-authored-by: evanq <mail.qxw.im> Co-authored-by: Sijie.Sun <sunsijie@buaa.edu.cn>