Refactor: 배경 씬 로더 시스템 개선 및 폴더 구조 정리

배경 씬 로더 기능 개선:
- BackgroundSceneDatabase 에셋 추가
- 플레이 모드 언로드 시 MarkSceneDirty 오류 수정
- Directional Light 및 NiloToonOverrider 백업/복원 기능
- 빌드 세팅 자동 추가 기능

배경 폴더 구조 정리:
- [초금비]방 → [공용]방 이름 변경
- [공용]루프탑 카페 씬 구조 정리 (Day/Night 씬 통합)
- 미사용 배경 삭제: [공용]교실, [공용]농구장

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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