I’m not familiar with this setup. But do you want for the server to boot as soon as it receive any packet addressed to its IP?

You need to send the WOL packet to the broadcast address of your network, not to the machine IP address. It this way all the machines on the network will receive it, including the ones that have been powered off for a while

Just use the directory listing of your favourite web server. You have a HTTP read only view of a directory and all of its content. If you self host likely you have already a reverse proxy, so it is just matter of updating its configuration. I’m sure it is supported by Apache, Nginx, LightHttpd, and Caddy. But I would expect every webserver supports it. Caddy is the easiest to use if you need to start from scratch.