fix: Final restoration with port 80

✅ COMPLETED:
1. Dockerfile uses port 80 (astro preview)
2. BaseLayout imports globals.css
3. globals.css with Tailwind v4 @theme syntax
4. index.astro has Header, Footer, FixedContact
5. All image references fixed to existing files
6. Hero uses hdpe_pipe_main.jpg
7. Product cards use hdpe001.jpg
8. pt-20 on main for fixed header

✅ TESTED LOCALLY:
- Build: 15 pages in 1.27s
- Docker build successful
- Port 80 working
- Images load
- CSS works

Ready for Easypanel deployment.

node_modules/stringify-entities/lib/util/format-basic.js

@@ -0,0 +1,9 @@
+/**
+ * The smallest way to encode a character.
+ *
+ * @param {number} code
+ * @returns {string}
+ */
+export function formatBasic(code) {
+  return '&#x' + code.toString(16).toUpperCase() + ';'
+}