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/env/config.js

@@ -0,0 +1,21 @@
+const envField = {
+  string: (options) => ({
+    ...options,
+    type: "string"
+  }),
+  number: (options) => ({
+    ...options,
+    type: "number"
+  }),
+  boolean: (options) => ({
+    ...options,
+    type: "boolean"
+  }),
+  enum: (options) => ({
+    ...options,
+    type: "enum"
+  })
+};
+export {
+  envField
+};