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

k-tv-backend/domain/src/entities.rs

@@ -81,6 +81,7 @@ pub struct Channel {
     pub timezone: String,
     pub schedule_config: ScheduleConfig,
     pub recycle_policy: RecyclePolicy,
+    pub auto_schedule: bool,
     pub created_at: DateTime<Utc>,
     pub updated_at: DateTime<Utc>,
 }
@@ -100,6 +101,7 @@ impl Channel {
             timezone: timezone.into(),
             schedule_config: ScheduleConfig::default(),
             recycle_policy: RecyclePolicy::default(),
+            auto_schedule: false,
             created_at: now,
             updated_at: now,
         }