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/is-port-reachable/index.js

@@ -0,0 +1,32 @@
+import net from 'node:net';
+
+export default async function isPortReachable(port, {host, timeout = 1000} = {}) {
+	if (typeof host !== 'string') {
+		throw new TypeError('Specify a `host`');
+	}
+
+	const promise = new Promise(((resolve, reject) => {
+		const socket = new net.Socket();
+
+		const onError = () => {
+			socket.destroy();
+			reject();
+		};
+
+		socket.setTimeout(timeout);
+		socket.once('error', onError);
+		socket.once('timeout', onError);
+
+		socket.connect(port, host, () => {
+			socket.end();
+			resolve();
+		});
+	}));
+
+	try {
+		await promise;
+		return true;
+	} catch {
+		return false;
+	}
+}