Init photobooth - borne photo evenementielle RPi4

Backend FastAPI complet : camera gphoto2, filtres/overlays Pillow,
chroma key OpenCV, multi-shot/collage, GIF, impression CUPS, email SMTP,
QR code. Frontend web vanilla (HTML/CSS/JS) pour Chromium kiosk.
Menu admin cache (appui long coin ecran). Toutes les fonctionnalites
activables/desactivables. Scripts install + systemd pour RPi4.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/photobooth.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=Photobooth
+After=network.target graphical.target
+
+[Service]
+Type=simple
+User=jules
+WorkingDirectory=/home/jules/Documents/Projet/photobooth-app
+ExecStart=/home/jules/Documents/Projet/photobooth-app/scripts/start.sh
+Restart=always
+RestartSec=5
+Environment=DISPLAY=:0
+
+[Install]
+WantedBy=graphical.target