Drop our --region build, prepare-region.sh, region skel, the preselected
China timezone, the explicit region in the configurator's JSON, Rime
bundling and its pin.
Every ISO bundles the cn profile; the first-screen pick decides. --region cn
only preselects China and names the artifact. The region value is cn, the cn
timezone is preselected when China is chosen, and the profile packages and
ArchLinuxCN keyring reach the target only for China.
ZacharyZhang-NY