chore: 외부 피니셔 애니메이션 팩 추가

- Brutal Unarmed Finisher 애니메이션 원본 FBX와 React 변형 세트를 프로젝트에 추가

- 샘플 컨트롤러, 프리팹, 씬, 재질 등 패키지 동봉 리소스를 함께 보관하도록 정리

Assets/External/Animations/Brutal_Unarmed_Finisher/Models/Material/blinn1.mat.meta

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