refactor(arr): give arr-api its own jellyfin client

arr-daemon depends on arr-api, so a handler in arr-api can never
reach the daemon's private JellyfinClient. Move it into arr-api and
attach an instance to AppState, so a manual subtitle write can ask
for the same refresh import already does (#195).

crates/arr-daemon/src/import.rs

@@ -25,9 +25,9 @@ use arr_db::Db;
 use arr_dl::TransmissionClient;
 use arr_probe::Prober;
 
-use crate::jellyfin::JellyfinClient;
 use crate::notify::Notifier;
 use crate::reconcile::{Action, ActionFuture, Outcome};
+use arr_api::jellyfin::JellyfinClient;
 
 /// A failure during one import tick.
 #[derive(Debug, thiserror::Error)]