Shipment status lookup API with sample data

Build a small Node HTTP JSON API for a logistics team to look up shipment status, using bundled sample data (at least 15 shipments, each with a list of timestamped scan events such as picked up, in transit, out for delivery, delivered). Endpoints: GET /api/shipments lists shipments with their current status; GET /api/shipments/:id/status returns the latest scan for that shipment with its timestamp and location; an unknown id returns 404 with a JSON error. The latest scan is the one with the newest timestamp, whatever order the events are stored in. No external services or database. Include a README documenting how to start the server, the endpoints and example responses.