* fix(sysproxy): use platform bypass separator
* refactor: squash conditional compilation logic
- Share a single `BYPASS_SEPERATOR` definition between both Linux and macOS
---------
Co-authored-by: Ayanami <ay@nami.ltd>
Co-authored-by: ❤是纱雾酱哟~ <49941141+Dragon1573@users.noreply.github.com>
Co-authored-by: oomeow <oomeow@outlook.com>