fix: gallery download - use local URL for proxy, rename file with event name + photo date

frontend/templates/public/gallery.html

@@ -35,7 +35,7 @@
   <button class="lightbox-close">&times;</button>
   <img id="lightbox-img" src="" alt="Photo">
   <div class="lightbox-actions">
-    <a class="btn btn-primary" id="lb-download" download>⬇ Télécharger la photo</a>
+    <a class="btn btn-primary" id="lb-download">⬇ Télécharger la photo</a>
   </div>
   <div class="text-xs text-muted">Connectez-vous au WiFi Photomaton pour télécharger</div>
 </div>
@@ -75,7 +75,7 @@ async function loadPhotos(page = 1) {
       <div class="photo-card" onclick="openLightbox('${p.full_url}', '${p.download_url}')">
         <img src="${p.thumb_url}" loading="lazy" alt="Photo" onerror="this.src='${p.full_url}'">
         <div class="photo-card-actions">
-          <a class="btn btn-primary btn-sm" href="${p.download_url}" download onclick="event.stopPropagation()">⬇ Télécharger</a>
+          <a class="btn btn-primary btn-sm" href="${p.download_url}" onclick="event.stopPropagation()">⬇ Télécharger</a>
         </div>
       </div>
     `).join('');