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/assets/endpoint/node.d.ts

@@ -0,0 +1,5 @@
+import type { APIRoute } from '../../types/public/common.js';
+/**
+ * Endpoint used in dev and SSR to serve optimized images by the base image services
+ */
+export declare const GET: APIRoute;