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/literal.js

@@ -0,0 +1,21 @@
+export function parseLiteralDef(def, refs) {
+    const parsedType = typeof def.value;
+    if (parsedType !== "bigint" &&
+        parsedType !== "number" &&
+        parsedType !== "boolean" &&
+        parsedType !== "string") {
+        return {
+            type: Array.isArray(def.value) ? "array" : "object",
+        };
+    }
+    if (refs.target === "openApi3") {
+        return {
+            type: parsedType === "bigint" ? "integer" : parsedType,
+            enum: [def.value],
+        };
+    }
+    return {
+        type: parsedType === "bigint" ? "integer" : parsedType,
+        const: def.value,
+    };
+}