Add Arch mirror manager: benchmark, apply, pin, restore, status

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

bin/omarchy-cn-mirror-status

@@ -0,0 +1,22 @@
+#!/bin/bash
+# omarchy:summary=Show current pacman mirror profile and servers
+# omarchy:examples=omarchycn mirror status
+
+set -euo pipefail
+
+source "$OMARCHY_PATH/cn/lib/mirror.sh"
+
+if [[ -f $CN_PROFILE_FILE ]]; then
+  echo "Profile: $(<"$CN_PROFILE_FILE")"
+else
+  echo "Profile: not managed by OmarchyCN"
+fi
+
+echo "Mirrorlist: $CN_MIRRORLIST"
+echo "Servers:"
+grep -E '^Server' "$CN_MIRRORLIST" | sed 's/^/  /'
+
+backups=("$CN_MIRRORLIST".omarchycn-bak-*)
+if [[ -e ${backups[0]} ]]; then
+  echo "Backups: ${#backups[@]} (latest: ${backups[-1]##*/})"
+fi