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/p-queue/dist/lower-bound.js

@@ -0,0 +1,18 @@
+// Port of lower_bound from https://en.cppreference.com/w/cpp/algorithm/lower_bound
+// Used to compute insertion index to keep queue sorted after insertion
+export default function lowerBound(array, value, comparator) {
+    let first = 0;
+    let count = array.length;
+    while (count > 0) {
+        const step = Math.trunc(count / 2);
+        let it = first + step;
+        if (comparator(array[it], value) <= 0) {
+            first = ++it;
+            count -= step + 1;
+        }
+        else {
+            count = step;
+        }
+    }
+    return first;
+}