Switch the region under Setup > Region, and offer China Apps

omarchy region cn|global switches an installed machine: cn upgrades,
trusts ArchLinuxCN through the rendered China config, records the
marker and links the developer mirrors, then refreshes pacman;
global undoes only what Omarchy made. The developer mirrors reach
new sessions only, so a terminal switch offers to log out.

Install > China Apps, shown only in China, installs WeChat, QQ,
Feishu, DingTalk, Tencent Meeting and WPS Office from the AUR and
sets up Tencent Docs, Yuque and Shimo as web apps.

manual/52-china.md describes the China region.

README.md

@@ -71,6 +71,7 @@ The manual lives in [`manual/`](manual/), which is its authoritative source.
 - [Omarchy on...](manual/49-omarchy-on.md)
 - [Dual Boot Install](manual/50-dual-boot-install.md)
 - [Unattended Installs](manual/51-unattended-installs.md)
+- [China](manual/52-china.md)
 
 ## License