feat(arr): sync manually grabbed subtitles with alass

The grab handler runs alass before recording the row, replacing the
sidecar with the synced text on acceptance and flagging it as
rejected otherwise (§15). Wires a Syncer into AppState, defaulting
to alass on PATH; the daemon binary points it at config.alass_path.

crates/arr-daemon/src/main.rs

@@ -150,7 +150,8 @@ async fn run() -> Result<(), Error> {
             config.opensubtitles_api_key,
             config.opensubtitles_username,
             config.opensubtitles_password,
-        ));
+        ))
+        .with_syncer(arr_subs::Syncer::new().with_binary(config.alass_path.clone()));
 
     let app = arr_api::router(state.clone())
         .merge(arr_compat::router(compat))