feat: 사망 애니메이션 및 무기 모델 추가

- Death_Default.fbx: 사망 애니메이션
- Death_Pose_Default.fbx: 사망 포즈
- SM_Wep_Sword_01.fbx: 검 무기 모델

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Assets/External_Used/Models/SM_Wep_Sword_01.fbx.meta

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