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/install.sh

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+#!/bin/bash
+# Installation du photobooth sur Raspberry Pi 4
+set -e
+
+echo "=== Installation Photobooth ==="
+
+# Mise a jour systeme
+sudo apt update && sudo apt upgrade -y
+
+# Dependances systeme
+sudo apt install -y \
+  python3 python3-pip python3-venv \
+  libgphoto2-dev \
+  cups libcups2-dev \
+  chromium-browser \
+  libopencv-dev python3-opencv \
+  unclutter
+
+# Creer le venv
+cd "$(dirname "$0")/.."
+python3 -m venv .venv
+source .venv/bin/activate
+
+# Installer les dependances Python
+pip install -r backend/requirements.txt
+
+# Creer les dossiers de donnees
+mkdir -p data/photos data/exports
+mkdir -p frontend/assets/overlays frontend/assets/backgrounds frontend/assets/sounds
+
+# Installer le service systemd
+sudo cp scripts/photobooth.service /etc/systemd/system/
+sudo systemctl daemon-reload
+sudo systemctl enable photobooth
+
+echo ""
+echo "=== Installation terminee ==="
+echo "Demarrer avec : sudo systemctl start photobooth"
+echo "Ou manuellement : ./scripts/start.sh"