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/cjs/parsers/null.js

@@ -0,0 +1,14 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.parseNullDef = void 0;
+function parseNullDef(refs) {
+    return refs.target === "openApi3"
+        ? {
+            enum: ["null"],
+            nullable: true,
+        }
+        : {
+            type: "null",
+        };
+}
+exports.parseNullDef = parseNullDef;