resolve create class error;

apps/course/views/live_session.py

@@ -65,7 +65,6 @@ class CourseLiveSessionRoomCreateAPIView(GenericAPIView):
             logger.info(f"[LiveSession Create] Found active session - session_id={session.id} room_id={room_id}")
         else:
             # No active session, always create a new one with a dynamic room_id
-            import time
             timestamp = int(time.time())
             room_id = f"room-{course.id}-{timestamp}"