Support mTLS / Client TLS Certificates

[nani8ot]

Is your feature request related to a problem? Please describe.
I would like to access Jellyfin from outside my network. However, the only option I have without exposing it directly to the internet is to use a VPN, which I would like to avoid. Configuring my reverse-proxy to require mutual TLS / client certificates could reduce the risk of exposing Jellyfin by adding an extra layer of protection.

Describe the solution you'd like
Support for specifying a client certificate in the client, for Jellyfin servers behind a reverse proxy with TLS client authentication.

Describe alternatives you've considered
I'm currently using a Wireguard VPN to connect to my home network.

Additional context

• Adding Client Certificate Choice Feature for TLS Authentication in Jellyfin Android App jellyfin/jellyfin-android#1222
• [Feature]: Support mTLS / Client TLS Certificates in Mobile App immich-app/immich#1611