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/astro/dist/cli/info/infra/process-package-manager-user-agent-provider.js

@@ -0,0 +1,7 @@
+class ProcessPackageManagerUserAgentProvider {
+  // https://docs.npmjs.com/cli/v8/using-npm/config#user-agent
+  userAgent = process.env.npm_config_user_agent ?? null;
+}
+export {
+  ProcessPackageManagerUserAgentProvider
+};