fix(BT12-Dev): Scene 16 Enemy 위치 복원 (Variant 폐기/재생성 시 default position 0,0,0 정정)

PD: "몬스터 위치가 모두 한 지점으로"

근본:
- 직전 e38c1a5에서 Variant 6 prefab 폐기·재생성
- 신규 Variant default position (0,0,0)·Scene 16 instance reference 정합되나 transform override 손상
- 결과: 16 instance 모두 (0,0,0)로 수렴

fix:
- Scene Ingame.unity만 8793f7b (Tutorial 패키지 제거 commit) 영역 복원
- Variant prefab 재생성 변경분 영역 유지 (root SR·Animator 폐기·Visual 자식 sprite override)
- Scene 16 Enemy 영역 위치 (직전 6c981ed 종별 균등 배치) 복원

회귀 영역 X:
- AnimationController RequireComponent 제거·Visual 자식 분리·flipX·sprite Visual 단일화 정합
- root SR/Animator 잔존 영역은 PD Editor 영역 자동 정리 또는 후속

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Assets/Scenes/Ingame.unity

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@@ -4531,7 +4531,7 @@ PrefabInstance:
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