Merge omacom/omarchy-iso#236 regional ISO builds, as an install-time choice

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.

configs/airootfs/root/.automated_script.sh

@@ -116,7 +116,7 @@ else
     mkdir -p -m 700 "$cjk_runtime"
     rm -f "$cjk_runtime/cjk-console-started" "$cjk_runtime/return-to-vt"
     cage_status=0
-    env -u OMARCHY_CJK_RELAUNCH XDG_RUNTIME_DIR=$cjk_runtime OMARCHY_CJK_CONSOLE=1 OMARCHY_INSTALL_REGION=china \
+    env -u OMARCHY_CJK_RELAUNCH XDG_RUNTIME_DIR=$cjk_runtime OMARCHY_CJK_CONSOLE=1 OMARCHY_INSTALL_REGION=cn \
       LANG=C.UTF-8 WLR_RENDERER=pixman cage -- foot -c /usr/share/omarchy-iso/foot.ini "$0" || cage_status=$?
     if [[ -f $cjk_runtime/return-to-vt ]]; then
       OMARCHY_INSTALL_REGION=global ./configurator && status=0 || status=$?
@@ -125,7 +125,7 @@ else
     else
       echo "The Chinese console could not start (cage exit $cage_status); continuing in English."
       unset OMARCHY_CJK_RELAUNCH
-      OMARCHY_INSTALL_REGION=china ./configurator && status=0 || status=$?
+      OMARCHY_INSTALL_REGION=cn ./configurator && status=0 || status=$?
     fi
   done
   if [[ -n ${OMARCHY_CJK_CONSOLE:-} ]] && ((status == vt_return)); then
@@ -145,7 +145,7 @@ 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)" == "china" ]]; then
+if [[ -n ${OMARCHY_CJK_CONSOLE:-} && "$(jq -r '.omarchy_install.region // "global"' /root/user_configuration.json)" == "cn" ]]; then
   export OMARCHY_INSTALL_LANG=zh
 fi