Fix China app installs and wire the CN AI stack into Install > AI

Offline installs ship no pacman sync db, so yay resolved official
repo dependencies as AUR packages and every catalog install failed;
omarchy-cn-app-install now runs a full -Syu first (verified end to
end: WeChat builds and installs in the VM). Kimi Code gains a real
installer command reused by the harness registry, the default-agent
path, and new Install > AI entries (Kimi Code, Deep Code, AI Hub),
and the AI Hub wizard offers to launch native harnesses immediately
so their official CLI login runs, matching how Claude Code works.

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

bin/omarchy-cn-kimi-install

@@ -0,0 +1,15 @@
+#!/bin/bash
+# omarchy:summary=Install Kimi Code with the official installer script
+# omarchy:examples=omarchycn kimi install
+
+set -euo pipefail
+
+if omarchy-cmd-present kimi; then
+  echo "Kimi Code 已安装"
+  exit 0
+fi
+
+installer=$(mktemp)
+trap 'rm -f "$installer"' EXIT
+curl -fsSL https://code.kimi.com/kimi-code/install.sh -o "$installer"
+bash "$installer"