Website restoration: Node.js backend, restored design, GitHub sync disabled

- Replaced broken .NET backend with Node.js/Express
- Restored original website design with purple gradient hero
- Updated homepage and shop pages with Bootstrap 5 responsive design
- Disabled GitHub remote sync - all code now stored locally only
- Created backup scripts and documentation
- All changes saved on Ubuntu server at /var/www/SkyArtShop

backend/node_modules/validator/lib/isMACAddress.js

@@ -0,0 +1,45 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = isMACAddress;
+var _assertString = _interopRequireDefault(require("./util/assertString"));
+function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
+var macAddress48 = /^(?:[0-9a-fA-F]{2}([-:\s]))([0-9a-fA-F]{2}\1){4}([0-9a-fA-F]{2})$/;
+var macAddress48NoSeparators = /^([0-9a-fA-F]){12}$/;
+var macAddress48WithDots = /^([0-9a-fA-F]{4}\.){2}([0-9a-fA-F]{4})$/;
+var macAddress64 = /^(?:[0-9a-fA-F]{2}([-:\s]))([0-9a-fA-F]{2}\1){6}([0-9a-fA-F]{2})$/;
+var macAddress64NoSeparators = /^([0-9a-fA-F]){16}$/;
+var macAddress64WithDots = /^([0-9a-fA-F]{4}\.){3}([0-9a-fA-F]{4})$/;
+function isMACAddress(str, options) {
+  (0, _assertString.default)(str);
+  if (options !== null && options !== void 0 && options.eui) {
+    options.eui = String(options.eui);
+  }
+  /**
+   * @deprecated `no_colons` TODO: remove it in the next major
+  */
+  if (options !== null && options !== void 0 && options.no_colons || options !== null && options !== void 0 && options.no_separators) {
+    if (options.eui === '48') {
+      return macAddress48NoSeparators.test(str);
+    }
+    if (options.eui === '64') {
+      return macAddress64NoSeparators.test(str);
+    }
+    return macAddress48NoSeparators.test(str) || macAddress64NoSeparators.test(str);
+  }
+  if ((options === null || options === void 0 ? void 0 : options.eui) === '48') {
+    return macAddress48.test(str) || macAddress48WithDots.test(str);
+  }
+  if ((options === null || options === void 0 ? void 0 : options.eui) === '64') {
+    return macAddress64.test(str) || macAddress64WithDots.test(str);
+  }
+  return isMACAddress(str, {
+    eui: '48'
+  }) || isMACAddress(str, {
+    eui: '64'
+  });
+}
+module.exports = exports.default;
+module.exports.default = exports.default;