fix: Fix product page syntax errors

1. Remove duplicate/broken code in product tables section
2. Fix PostCSS config for Tailwind 4
3. Add @tailwindcss/postcss dependency
4. Remove --production flag from Dockerfile (sharp required)

All fixes enable successful Docker build with favicon working.

node_modules/astro/dist/manifest/virtual-module.d.ts

@@ -0,0 +1,5 @@
+import type { Plugin } from 'vite';
+import type { SSRManifest } from '../types/public/index.js';
+export default function virtualModulePlugin({ manifest }: {
+    manifest: SSRManifest;
+}): Plugin;