放入官网已有 server { … } 内，与 location / 并列；不要再套一层 server。若已有相同路径的 location，请修改已有段。保存前检查 Nginx 语法，再重载。

location = /llms.txt {
    types { }
    default_type text/plain;
    charset utf-8;
    charset_types text/plain;
    try_files $uri =404;
}
location = /robots.txt {
    types { }
    default_type text/plain;
    charset utf-8;
    charset_types text/plain;
    try_files $uri =404;
}
location = /sitemap.xml {
    types { }
    default_type application/xml;
    charset utf-8;
    charset_types application/xml;
    try_files $uri =404;
}