Ability to use jellyfin access token for user authentication

[herrrta]

Description

Instead of maintain session cookies for authentication, middleware should allow use of user specified jellyfin api keys.

This will make it easier for other apps/users to integrate with seerr

Desired Behavior

Middleware should allow for X-API-Key to either be system provided api key OR jellyfin auth token

Other media server types can follow the same format in the future too

Additional Context

No response

Code of Conduct

• [x] I agree to follow Seerr's Code of Conduct