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>

frontend/js/websocket.js

@@ -0,0 +1,48 @@
+/* Communication WebSocket avec le backend */
+
+let ws = null;
+let wsReconnectTimer = null;
+const wsCallbacks = {};
+
+function wsConnecter() {
+  const proto = location.protocol === 'https:' ? 'wss:' : 'ws:';
+  ws = new WebSocket(`${proto}//${location.host}/ws`);
+
+  ws.onopen = () => {
+    console.log('WebSocket connecte');
+    if (wsReconnectTimer) {
+      clearInterval(wsReconnectTimer);
+      wsReconnectTimer = null;
+    }
+  };
+
+  ws.onmessage = (event) => {
+    const msg = JSON.parse(event.data);
+    const cb = wsCallbacks[msg.type];
+    if (cb) cb(msg);
+  };
+
+  ws.onclose = () => {
+    console.log('WebSocket deconnecte, reconnexion dans 3s...');
+    if (!wsReconnectTimer) {
+      wsReconnectTimer = setInterval(wsConnecter, 3000);
+    }
+  };
+
+  ws.onerror = () => {
+    ws.close();
+  };
+}
+
+function wsEnvoyer(msg) {
+  if (ws && ws.readyState === WebSocket.OPEN) {
+    ws.send(JSON.stringify(msg));
+  }
+}
+
+function wsOnMessage(type, callback) {
+  wsCallbacks[type] = callback;
+}
+
+// Connexion au demarrage
+wsConnecter();