Add dev-mirror manager for npm, pip, cargo, go, gem, docker

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

bin/omarchy-cn-dev-mirror-set

@@ -0,0 +1,20 @@
+#!/bin/bash
+# omarchy:summary=Point one development ecosystem at a custom registry URL
+# omarchy:args=<target> <url>
+# omarchy:examples=omarchycn dev-mirror set npm https://registry.example.com
+
+set -euo pipefail
+
+source "$OMARCHY_PATH/cn/lib/dev-mirror.sh"
+
+target="${1:?usage: omarchycn dev-mirror set <target> <url>}"
+url="${2:?usage: omarchycn dev-mirror set <target> <url>}"
+
+if [[ ! " ${CN_DM_TARGETS[*]} " == *" $target "* ]]; then
+  echo "Unknown target: $target (known: ${CN_DM_TARGETS[*]})" >&2
+  exit 1
+fi
+
+cn_dm_backup "$(cn_dm_config_file "$target")" "$(date +%Y%m%d-%H%M%S)"
+"cn_dm_set_$target" "$url"
+echo "$target -> $url"