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/infra/process-operating-system-provider.js

@@ -0,0 +1,12 @@
+class ProcessOperatingSystemProvider {
+  #platformToOs = {
+    darwin: "macOS",
+    win32: "Windows",
+    linux: "Linux"
+  };
+  name = process.platform;
+  displayName = `${this.#platformToOs[this.name] ?? this.name} (${process.arch})`;
+}
+export {
+  ProcessOperatingSystemProvider
+};