쿠콘 문의사항 추가

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

plan/node_modules/isarray/index.js

@@ -0,0 +1,5 @@
+var toString = {}.toString;
+
+module.exports = Array.isArray || function (arr) {
+  return toString.call(arr) == '[object Array]';
+};