feat: 드로그 보스 AI 및 런타임 상태 구조 재구성

- 드로그 전투 컨텍스트를 BossBehaviorRuntimeState 중심 구조로 정리하고 BossEnemy, 패턴 액션, 조건 노드가 마지막 실행 결과와 phase 상태를 직접 사용하도록 갱신
- BT_Drog와 재빌드 에디터 스크립트를 확장해 phase 전환, 집행 결과 분기, 거리/쿨타임 기반 패턴 선택을 드로그 전용 자산과 노드 파라미터로 재구성
- 드로그 패턴/스킬/이펙트/애니메이션 플레이스홀더 자산을 재생성하고 보스 프리팹이 새 런타임 상태 및 등록 클립 구성을 참조하도록 정리

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