feat: Update Nginx configuration to include openapi.json in location block

nginx.conf

@@ -28,7 +28,7 @@ http {
         listen 80;
         server_name _;
 
-        location ~ ^/(api|docs) {
+        location ~ ^/(api|docs|openapi\.json$) {
             proxy_pass http://127.0.0.1:8000;
             proxy_set_header Host $host;
             proxy_set_header X-Real-IP $remote_addr;