saeloun/dqor-tickets ? reverse-engineered prompt

Build me a self hosted conference ticketing app for a single event, Deccan Queen on Rails 2026.

I want people to browse ticket tiers, buy one or more tickets in a single order, and pay through Razorpay. The app should hold inventory for pending orders for a short time, confirm payment only after a verified webhook or a safe fallback check, and then mark the order paid. It should generate proper GST invoices for India, including invoice numbering, taxes, and credit notes for refunds. After payment, send a confirmation email with the invoice and ticket PDFs attached.

I also want a simple admin area to manage ticket tiers, view orders and attendees, issue refunds, send confirmation emails again, export CSV, and see basic sales stats. Make sure each ticket has a QR code and there is a mobile friendly check in screen where staff can search attendees and scan tickets at the door. Use Rails 8, keep it self hosted, and if you need to check current docs for Razorpay or PDF generation, look them up online.