Add /files/ proxy in nginx config for signed URLs

imago-admin/nginx/default.conf

@@ -18,6 +18,15 @@ server {
         proxy_set_header X-Forwarded-Proto $scheme;
     }
 
+    # Proxy pour les fichiers signés (thumbnails, downloads)
+    location /files/ {
+        proxy_pass http://backend:8000;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
     location /admin/api/ {
         proxy_pass http://backend:8000;
         proxy_set_header Host $host;