feat: add default_has_deadline to ChoreSchedule and update related components for deadline management

backend/api/chore_schedule_api.py

@@ -60,6 +60,7 @@ def set_chore_schedule(child_id, task_id):
             return jsonify({'error': 'day_configs must be a list', 'code': ErrorCodes.INVALID_VALUE}), 400
         default_hour = data.get('default_hour', 8)
         default_minute = data.get('default_minute', 0)
+        default_has_deadline = data.get('default_has_deadline', True)
         schedule = ChoreSchedule(
             child_id=child_id,
             task_id=task_id,
@@ -67,6 +68,7 @@ def set_chore_schedule(child_id, task_id):
             day_configs=day_configs,
             default_hour=default_hour,
             default_minute=default_minute,
+            default_has_deadline=default_has_deadline,
         )
     else:
         interval_days = data.get('interval_days', 2)