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/devlop/lib/default.js

@@ -0,0 +1,9 @@
+export function deprecate(fn) {
+  return fn
+}
+
+export function equal() {}
+
+export function ok() {}
+
+export function unreachable() {}