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/zod-to-json-schema/dist/esm/parsers/never.js

@@ -0,0 +1,11 @@
+import { parseAnyDef } from "./any.js";
+export function parseNeverDef(refs) {
+    return refs.target === "openAi"
+        ? undefined
+        : {
+            not: parseAnyDef({
+                ...refs,
+                currentPath: [...refs.currentPath, "not"],
+            }),
+        };
+}