feat(api): expose series and season on episodes

crates/arr-api/src/series.rs

@@ -107,7 +107,11 @@ pub struct Season {
 #[derive(Debug, Clone, Serialize, ToSchema)]
 pub struct Episode {
     pub id: i64,
+    /// The owning series — the episode deck route needs it without walking
+    /// seasons first.
+    pub series_id: i64,
     pub season_id: i64,
+    pub season_number: i64,
     pub number: i64,
     pub title: String,
     pub air_date: Option<String>,
@@ -660,7 +664,9 @@ async fn load_seasons(state: &AppState, series_id: i64) -> Result<Vec<Season>, A
                 .filter(|episode| episode.season_id == season.id)
                 .map(|episode| Episode {
                     id: episode.id,
+                    series_id,
                     season_id: episode.season_id,
+                    season_number: episode.season_number,
                     number: episode.number,
                     title: episode.title.clone(),
                     air_date: episode.air_date.clone(),
@@ -881,7 +887,9 @@ async fn load_episode(state: &AppState, id: i64) -> Result<Episode, ApiError> {
     .ok_or(ApiError::EpisodeNotFound)?;
     Ok(Episode {
         id: row.id,
+        series_id: row.series_id,
         season_id: row.season_id,
+        season_number: row.season_number,
         number: row.number,
         title: row.title,
         air_date: row.air_date,