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/lodash/math.js

@@ -0,0 +1,17 @@
+module.exports = {
+  'add': require('./add'),
+  'ceil': require('./ceil'),
+  'divide': require('./divide'),
+  'floor': require('./floor'),
+  'max': require('./max'),
+  'maxBy': require('./maxBy'),
+  'mean': require('./mean'),
+  'meanBy': require('./meanBy'),
+  'min': require('./min'),
+  'minBy': require('./minBy'),
+  'multiply': require('./multiply'),
+  'round': require('./round'),
+  'subtract': require('./subtract'),
+  'sum': require('./sum'),
+  'sumBy': require('./sumBy')
+};