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-restore

@@ -0,0 +1,19 @@
+#!/bin/bash
+# omarchy:summary=Restore the most recent mirrorlist backup
+# omarchy:examples=omarchycn mirror restore
+# omarchy:requires-sudo=true
+
+set -euo pipefail
+
+source "$OMARCHY_PATH/cn/lib/mirror.sh"
+
+backups=("$CN_MIRRORLIST".omarchycn-bak-*)
+if [[ ! -e ${backups[0]} ]]; then
+  echo "No OmarchyCN mirrorlist backups found" >&2
+  exit 1
+fi
+
+latest="${backups[-1]}"
+sudo cp "$latest" "$CN_MIRRORLIST"
+rm -f "$CN_PROFILE_FILE"
+echo "Restored $CN_MIRRORLIST from ${latest##*/}"