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/express-validator/lib/base.js

@@ -0,0 +1,8 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.ValidationHalt = exports.contextsKey = void 0;
+// Not using Symbol because of #813
+exports.contextsKey = 'express-validator#contexts';
+class ValidationHalt extends Error {
+}
+exports.ValidationHalt = ValidationHalt;