Ship Chinese IME and font fallback by default on zh_CN systems

fcitx5-rime, fcitx5-chinese-addons, and fcitx5-configtool join the
base package set, and a provisioning step seeds the Rime profile and
CJK fontconfig for users on systems whose locale is zh_CN, so Chinese
input works at first boot without omarchycn setup.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QKxGW1raAWaqeU8WdHsMsp

install/user/cn-chinese.sh

@@ -0,0 +1,14 @@
+# Seed Chinese input and CJK font fallback on zh_CN systems.
+
+grep -qs "^LANG=zh_CN" /etc/locale.conf || exit 0
+
+if [[ ! -f ~/.config/fcitx5/profile ]]; then
+  mkdir -p ~/.config/fcitx5
+  cp "$OMARCHY_PATH/cn/fcitx5/profile" ~/.config/fcitx5/profile
+fi
+
+if [[ ! -f ~/.config/fontconfig/conf.d/64-omarchycn-cjk.conf ]]; then
+  mkdir -p ~/.config/fontconfig/conf.d
+  cp "$OMARCHY_PATH/cn/fontconfig/64-omarchycn-cjk.conf" ~/.config/fontconfig/conf.d/
+  fc-cache -f > /dev/null
+fi