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/prismjs/components/prism-nand2tetris-hdl.js

@@ -0,0 +1,9 @@
+Prism.languages['nand2tetris-hdl'] = {
+	'comment': /\/\/.*|\/\*[\s\S]*?(?:\*\/|$)/,
+	'keyword': /\b(?:BUILTIN|CHIP|CLOCKED|IN|OUT|PARTS)\b/,
+	'boolean': /\b(?:false|true)\b/,
+	'function': /\b[A-Za-z][A-Za-z0-9]*(?=\()/,
+	'number': /\b\d+\b/,
+	'operator': /=|\.\./,
+	'punctuation': /[{}[\];(),:]/
+};