Intégration station d'impression photo (photostation)

- Icône discrète coin bas-gauche, visible seulement si photostation installée
- Popup PIN (4 chiffres) avant lancement
- Backend : /api/photostation/disponible + /api/photostation/lancer
- kiosk-session.sh : Chromium attend le flag /tmp/photostation_running avant redémarrage
- Script install-photostation.sh pour déploiement sur la Surface

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/js/app.js

@@ -15,6 +15,7 @@ async function init() {
   setupModes();
   setupOnglets();
   chargerBoothInfo();
+  verifierPhotostationDisponible();
 }
 
 function appliquerConfig() {
@@ -137,6 +138,8 @@ function setupEcranAccueil() {
 // --- Admin : icone + mot de passe ---
 
 const MDP_ADMIN = '1234';
+const PIN_PHOTOSTATION = '1234';
+let _pinPhotostationSaisi = '';
 
 function ouvrirAdmin() {
   const popup = document.getElementById('popup-mdp');
@@ -161,6 +164,59 @@ function paveEffacer() {
   input.value = input.value.slice(0, -1);
 }
 
+// --- Photostation ---
+
+async function verifierPhotostationDisponible() {
+  const data = await apiGet('/api/photostation/disponible').catch(() => null);
+  if (data?.disponible) {
+    document.getElementById('btn-photostation').classList.remove('cache');
+  }
+}
+
+function ouvrirPhotostation() {
+  _pinPhotostationSaisi = '';
+  _majAffichagePin();
+  document.getElementById('pin-photostation-erreur').classList.add('cache');
+  document.getElementById('popup-pin-photostation').classList.remove('cache');
+}
+
+function fermerPopupPhotostation() {
+  document.getElementById('popup-pin-photostation').classList.add('cache');
+  _pinPhotostationSaisi = '';
+}
+
+function pinPhotostationTouche(c) {
+  if (_pinPhotostationSaisi.length >= 4) return;
+  _pinPhotostationSaisi += c;
+  _majAffichagePin();
+  if (_pinPhotostationSaisi.length === 4) {
+    setTimeout(_validerPinPhotostation, 150);
+  }
+}
+
+function pinPhotostationEffacer() {
+  _pinPhotostationSaisi = _pinPhotostationSaisi.slice(0, -1);
+  _majAffichagePin();
+}
+
+function _majAffichagePin() {
+  const n = _pinPhotostationSaisi.length;
+  const el = document.getElementById('pin-photostation-affichage');
+  el.textContent = '●'.repeat(n) + '○'.repeat(4 - n);
+}
+
+async function _validerPinPhotostation() {
+  if (_pinPhotostationSaisi !== PIN_PHOTOSTATION) {
+    document.getElementById('pin-photostation-erreur').classList.remove('cache');
+    _pinPhotostationSaisi = '';
+    _majAffichagePin();
+    return;
+  }
+  fermerPopupPhotostation();
+  afficherStatut('Lancement de la station d\'impression...', 'succes');
+  await apiPost('/api/photostation/lancer', {});
+}
+
 function validerMdpAdmin() {
   const input = document.getElementById('input-mdp-admin');
   if (input.value === MDP_ADMIN) {