- Add isInvitation (nullable bool) to BilletOrder: null=no badge, true=invitation
- PDF footer: add SIRET, email, phone of organizer
- PDF: show invitation badge based on ticket.isInvitation instead of design
- Rename "Sortie libre" to "Sortie - Entree illimitee"
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
