devtiro/devtiro-event-ticket-app ? reverse-engineered prompt

Build me a full stack event ticket app that lets organizers create events and sell tickets, lets people browse events and buy tickets, and lets staff scan QR codes at the door to check tickets in. I want a clean React frontend and a Spring Boot backend with login and role based access using Keycloak, plus a PostgreSQL database for the data. Please set it up so I can run the whole thing locally with Docker, then start the backend and frontend separately, and make sure the frontend talks to the backend through the right local port.

Keep the app simple and polished, with the main flows covered, sign in, event creation, ticket purchase, ticket listing, and QR scanning. Use a sensible layered structure, separate data transfer objects from entities, and centralized error handling. If you need to check the current docs for any setup details, go ahead and look them up online.