Merge omacom/omarchy-iso#241: region from the timezone in one ISO

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.

configs/airootfs/root/.automated_script.sh

@@ -145,7 +145,8 @@ if [[ -f /root/defer-provisioning ]] ||
   export OMARCHY_UI_DEFER_PROVISIONING=yes
 fi
 
-if [[ -n ${OMARCHY_CJK_CONSOLE:-} && "$(jq -r '.omarchy_install.region // "global"' /root/user_configuration.json)" == "cn" ]]; then
+# Only Chinese reaches the install from the CJK console; English returns to the VT.
+if [[ -n ${OMARCHY_CJK_CONSOLE:-} ]]; then
   export OMARCHY_INSTALL_LANG=zh
 fi