Restaurant Menu API

Problem Description

Build the backend API for a restaurant chain's mobile app. The app displays the menu, lets customers view item details and nutrition info, and lets authenticated users view their order history and saved favorites.

Output Specification

Produce a self-contained server.js (or server.ts) file with an Express app that:

1. Has a GET /api/menu route that returns all menu categories with items.
2. Has a GET /api/menu/:itemId route that returns details for a single menu item including nutrition info.
3. Has a GET /api/locations route that returns restaurant locations.
4. Has a GET /api/me/orders route (behind auth middleware) that returns the authenticated user's order history.
5. Has a GET /api/me/favorites route (behind auth middleware) that returns the user's saved favorite items.
6. Has a POST /api/orders route (behind auth middleware) that places a new order.
7. Stores data in memory (arrays or Maps are fine).
8. Returns JSON responses with appropriate HTTP status codes.
9. Listens on port 3000.

The code should be production-ready for a popular restaurant chain with millions of daily app users.