feat: 보스 패턴 시스템 구현

- BossPatternData SO로 스킬/Wait 스텝 순서와 쿨타임 정의
- UsePatternAction으로 Behavior Graph에서 패턴 실행
- 보스 전용 애니메이션 분리 및 AnimatorOverrideController 정상화

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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