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-stream/index.js

@@ -0,0 +1,28 @@
+'use strict';
+
+const isStream = stream =>
+	stream !== null &&
+	typeof stream === 'object' &&
+	typeof stream.pipe === 'function';
+
+isStream.writable = stream =>
+	isStream(stream) &&
+	stream.writable !== false &&
+	typeof stream._write === 'function' &&
+	typeof stream._writableState === 'object';
+
+isStream.readable = stream =>
+	isStream(stream) &&
+	stream.readable !== false &&
+	typeof stream._read === 'function' &&
+	typeof stream._readableState === 'object';
+
+isStream.duplex = stream =>
+	isStream.writable(stream) &&
+	isStream.readable(stream);
+
+isStream.transform = stream =>
+	isStream.duplex(stream) &&
+	typeof stream._transform === 'function';
+
+module.exports = isStream;