[Abnormality] 이상 상태 시스템 구현

- 이상 상태 데이터 (버프/디버프) ScriptableObject 정의
- 런타임임 활성 이상 상태 관리 (ActiveAbnormality)
- 캐릭터터별 AbnormalityManager 컴포넌트로 이상 상태 적용/제거
- 스킬 효과(AbnormalityEffect)로 스킬에 이상 상태 연동
- UI 슬롯 및 목록 표시 구현 (버프/디버프 구분)
- 테스트 코드 및 씬 설정 추가

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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