feat(channel): add auto-schedule feature to channels with background scheduler

k-tv-backend/domain/src/services/schedule/mod.rs

@@ -206,6 +206,14 @@ impl ScheduleEngineService {
             })
     }
 
+    /// Return the most recently generated schedule for a channel (used by the background scheduler).
+    pub async fn get_latest_schedule(
+        &self,
+        channel_id: ChannelId,
+    ) -> DomainResult<Option<GeneratedSchedule>> {
+        self.schedule_repo.find_latest(channel_id).await
+    }
+
     /// Look up the schedule currently active at `at` without generating a new one.
     pub async fn get_active_schedule(
         &self,