chore: 무기 시스템용 씬 및 프리팹 업데이트

- Player 프리팹에 WeaponEquipment 컴포넌트 추가
- 테스트 씬에서 무기 시스템 테스트 가능하도록 설정
- NetworkPrefab 목록 업데이트

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

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

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