add file upload for issue

nginx.conf.template

@@ -6,6 +6,8 @@ server {
     index index.html;
 
     location /api/ {
+        # Matches the backend FILE_MAX_SIZE_MB (default 1m would reject uploads)
+        client_max_body_size 25m;
         proxy_pass http://${BACKEND_UPSTREAM}/api/;
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;