Drop western default apps from the CN default set

Basecamp, Discord, HEY, Google Contacts/Maps/Messages/Photos,
WhatsApp, and X lose their shipped launchers, webapp keybindings,
and the whatsapp-slim extension; aether, libreoffice-fresh, and
obs-studio leave the base package set. The HEY mailto handler and
its registration go with them. Preinstall add/remove lists, the
launcher hide list, and chromium flags stay in sync.

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

install/omarchy-base.packages

@@ -1,7 +1,6 @@
 # Omarchy core package list pacstrapped by the ISO.
 # The ISO builder also reads this file when constructing the offline mirror.
 
-aether
 alsa-utils
 asdcontrol
 avahi
@@ -74,7 +73,6 @@ less
 libsecret
 libvips
 libyaml
-libreoffice-fresh
 llvm
 localsend
 lua51
@@ -93,7 +91,6 @@ noto-fonts-cjk
 noto-fonts-emoji
 nss-mdns
 nvim
-obs-studio
 obsidian
 omacalc
 omacut