GET /api/qrcode returns the QR for the upload URL of the event.
?format=png (default, 800px) for screen, ?format=svg for vector, and
?format=pdf for an A6 printable card with the couple's names, the
event date (if set), and a "Aponte a câmera" instruction. The
encoded URL defaults to the request's origin + /enviar so it works
across environments without extra config; ?url= overrides for tests.
https://claude.ai/code/session_01TPBqgcSJMppgrpiq7fLywL
