빌드 설정 개선 및 이미지 경로 문제 해결

- package.json: preview 및 build 스크립트에 환경변수 설정 추가
- 이미지 파일을 public/images 디렉토리로 이동하여 빌드 호환성 확보
- IMAGE_ROOT 상수를 '/images'로 변경하여 빌드 환경 지원
- .env.production 파일 추가로 프로덕션 환경 설정 분리

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

public/images/chk_scrap_off.svg

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