[작업할 내용 공유] Part1 6.9 Decorators and forwarding, call/apply 과제 번역

### 작업할 내용
Part1 Decorators and forwarding, call/apply의 과제 번역 진행하겠습니다.

대시보드 수정하였습니다.

Locate Part1 section 6.9, “Decorators and forwarding, call/apply,” and review its exercises in the tutorial source. Translate the section into Korean, then verify that the translated content is reflected in the dashboard mentioned in the issue. Done means the section and its exercises are translated and the dashboard is updated.

Written by the indexing model from the issue text.