Remove dead re-export barrel src/types/config.ts (#3144)

* Initial plan

* Remove dead re-export barrel src/types/config.ts and its test

* fix: update docker.ts import after config.ts deletion

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

Author: Copilot