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/cli/domain/help-payload.d.ts

@@ -0,0 +1,7 @@
+export interface HelpPayload {
+    commandName: string;
+    headline?: string;
+    usage?: string;
+    tables?: Record<string, [command: string, help: string][]>;
+    description?: string;
+}