Add Simplified Chinese as a system language

The installer asks for the language before the keyboard, and
Setup > Language (omarchy language en|zh) switches it later. Under
zh_CN the menu reads its labels from omarchy-menu.zh-cn.jsonc, the
shell from I18nZh.js through I18n.tr, and notifications are worded
by their sender through omarchy-text, which reads the same table.
User text is never translated.

bin/omarchy-windows-vm

@@ -1420,7 +1420,7 @@ launch_windows() {
   if ! priv up_wait; then
     echo "❌ Failed to start Windows VM!"
     echo "   Try checking: omarchy-windows-vm status"
-    omarchy-notification-send -u critical "Windows VM" "Failed to start Windows VM"
+    omarchy-notification-send -u critical "$(omarchy-text "Windows VM")" "$(omarchy-text "Failed to start Windows VM")"
     exit 1
   fi