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/isHash.js

@@ -0,0 +1,30 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = isHash;
+var _assertString = _interopRequireDefault(require("./util/assertString"));
+function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
+var lengths = {
+  md5: 32,
+  md4: 32,
+  sha1: 40,
+  sha256: 64,
+  sha384: 96,
+  sha512: 128,
+  ripemd128: 32,
+  ripemd160: 40,
+  tiger128: 32,
+  tiger160: 40,
+  tiger192: 48,
+  crc32: 8,
+  crc32b: 8
+};
+function isHash(str, algorithm) {
+  (0, _assertString.default)(str);
+  var hash = new RegExp("^[a-fA-F0-9]{".concat(lengths[algorithm], "}$"));
+  return hash.test(str);
+}
+module.exports = exports.default;
+module.exports.default = exports.default;