fix(radarr): model the download status as a DownloadStatus enum

Radarr was the only tree still holding DownloadRecord.status as a bare
String and comparing it against literals. It now carries its own
DownloadStatus enum, shaped exactly like the Sonarr, Lidarr and Readarr
copies, and is guarded with from_json_or_default so an unrecognised
status degrades to Unknown instead of failing the whole queue fetch.

The row-style decorator and get_movie_status compare against the enum
variants. The status cell is never rendered in the Radarr tree, so no
snapshot changes; the CLI JSON output is unchanged for every real value
since the enum serializes to the same camelCase strings.

src/network/radarr_network/library/mod.rs

@@ -1,6 +1,6 @@
 use crate::models::radarr_models::{
   AddMovieBody, AddMovieSearchResult, Credit, CreditType, DeleteMovieParams, DownloadRecord,
-  EditMovieParams, Movie, MovieCommandBody, MovieHistoryItem, RadarrRelease,
+  DownloadStatus, EditMovieParams, Movie, MovieCommandBody, MovieHistoryItem, RadarrRelease,
   RadarrReleaseDownloadBody,
 };
 use crate::models::servarr_data::Notification;
@@ -664,11 +664,11 @@ pub(in crate::network::radarr_network::library) fn get_movie_status(
       .iter()
       .find(|&download| download.movie_id == movie_id)
     {
-      if download.status == "downloading" {
+      if download.status == DownloadStatus::Downloading {
         return "Downloading".to_owned();
       }
 
-      if download.status == "completed" {
+      if download.status == DownloadStatus::Completed {
         return "Awaiting Import".to_owned();
       }
     }