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-apply

@@ -0,0 +1,35 @@
+#!/bin/bash
+# omarchy:summary=Apply a mirror profile or pin one mirror for pacman
+# omarchy:args=<china|official|mirror-id>
+# omarchy:examples=omarchycn mirror apply china | omarchycn mirror apply official | omarchycn mirror apply tuna
+# omarchy:requires-sudo=true
+
+set -euo pipefail
+
+source "$OMARCHY_PATH/cn/lib/mirror.sh"
+
+target="${1:?usage: omarchycn mirror apply <china|official|mirror-id>}"
+
+case "$target" in
+china)
+  echo "Benchmarking China mirrors..."
+  mapfile -t ranked < <(cn_mirror_rank $(cn_mirror_ids_by_region cn))
+  if (( ${#ranked[@]} == 0 )); then
+    echo "No healthy China mirror reachable; keeping current mirrorlist" >&2
+    exit 1
+  fi
+  # Primary + up to two backups
+  cn_mirror_write_list china "${ranked[@]:0:3}"
+  ;;
+official)
+  cn_mirror_write_list official geo worldwide
+  ;;
+*)
+  url=$(cn_mirror_url "$target")
+  if [[ -z $url ]]; then
+    echo "Unknown mirror id: $target (see: omarchycn mirror benchmark)" >&2
+    exit 1
+  fi
+  cn_mirror_write_list "pin:$target" "$target"
+  ;;
+esac