feat: 드로그 집행 개시 패턴 및 낙인 디버프 추가

- 드로그 시그니처 패턴 역할과 집행 개시 패턴 데이터를 추가하고 BT 브랜치에 연결
- 시그니처 차단 성공과 실패 흐름을 BossCombatBehaviorContext에 구현하고 authoring 그래프를 재구성
- 집행자의 낙인 이상상태를 추가하고 받는 피해 배율 증가가 플레이어 대미지 계산에 반영되도록 정리
- 집행 실패 시 광역 피해, 넉백, 다운, 낙인 부여 설정을 드로그 프리팹에 연결
- 성공 경로 검증 중 확인된 보스 Hit 트리거 오류를 방어 로직으로 수정
- Unity 플레이 검증으로 집행 개시 실패와 성공 분기를 모두 확인하고 설계값은 원복

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