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/gauge/set-immediate.js

@@ -0,0 +1,7 @@
+'use strict'
+var process = require('./process')
+try {
+  module.exports = setImmediate
+} catch (ex) {
+  module.exports = process.nextTick
+}