Checkout Page for an Online Store

Problem Description

Build a simple checkout page for an online store. The page should have a form where the customer enters their name and selects an item, then clicks "Place Order" to submit their order.

The backend should be an Express.js server with a POST /api/orders endpoint that creates a new order in an in-memory array (no database needed) and returns the created order as JSON.

The frontend should be a single HTML file that shows the form and displays a confirmation message when the order is placed successfully.

Output Specification

Produce:

1. A server.js file with an Express app that:

   • Serves a static HTML file
   • Has a POST /api/orders route that accepts { customerName, item } and returns the created order with an id
   • Listens on port 3000

2. A public/index.html file with:

   • A form with customer name input, item input, and a "Place Order" button
   • JavaScript that submits the form data to POST /api/orders using fetch
   • Displays a confirmation message on success