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-yang.min.js

@@ -0,0 +1 @@
+Prism.languages.yang={comment:/\/\*[\s\S]*?\*\/|\/\/.*/,string:{pattern:/"(?:[^\\"]|\\.)*"|'[^']*'/,greedy:!0},keyword:{pattern:/(^|[{};\r\n][ \t]*)[a-z_][\w.-]*/i,lookbehind:!0},namespace:{pattern:/(\s)[a-z_][\w.-]*(?=:)/i,lookbehind:!0},boolean:/\b(?:false|true)\b/,operator:/\+/,punctuation:/[{};:]/};