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>

Assets/Skills/Melee_Slash_Boss.asset

@@ -15,8 +15,8 @@ MonoBehaviour:
   skillName: "\uBCA0\uAE30"
   description: 
   icon: {fileID: 0}
-  skillClip: {fileID: -7717634560727564301, guid: 0f6fd9302e489b94d96774e2713b1317, type: 3}
-  endClip: {fileID: -8265974341663887746, guid: fbcbf9c09792c924296ac6036e76f6dc, type: 3}
+  skillClip: {fileID: -7717634560727564301, guid: 4005a77aa7d531742b1de1bec27001b1, type: 3}
+  endClip: {fileID: -8265974341663887746, guid: d3e4690f866332b43b86ee7005291cd0, type: 3}
   useRootMotion: 1
   ignoreRootMotionY: 1
   cooldown: 1