* refactor: rename WorkerExtension to TemplateUiCommand, HeadlessWorkerExtension to HeadlessCommand
* ci: update npm publish workflow to include refactor branch
* ci: add push trigger for JSR publish workflow and bump API package version
* ci: add pnpm setup to npm publish workflow
* chore: add repository field to package.json for @kksh/api
* chore: add check-types
* refactor: api package file structure update
* feat: add headless worker extension API
* feat: add HeadlessCmd to manifest schema
* feat: make each type of cmds optional in manifest
There may be more types of cmds in the future, this makes backward compatibility easier.
* feat: implement headless extension command in app
A demo cmd implemented as well.
* refactor: move api package's API server files
* refactor: reformat all
