chore: Update standalone nginx proxy config to include /retry endpoint

Author: dormant-user

rutorrent-ui/nginx/upstream.conf

@@ -9,7 +9,7 @@ server {
     set $backend_origin http://192.168.1.230:3000;
 
     # Shared proxy config for API-style routes
-    location ~ ^/(torrent|authenticator|version)$ {
+    location ~ ^/(torrent|authenticator|version|retry)$ {
         proxy_pass $backend_origin;
         proxy_http_version 1.1;