feat: 플레이어 다운 및 넉백 피격 반응 추가

- HitReactionController로 다운과 넉백 전용 로직을 분리
- 다운 시작, 루프, 회복 애니메이션과 DownEffect를 연결
- 행동 상태와 스킬 취소가 피격 반응과 연동되도록 정리
- 자동 검증 러너에 다운 및 넉백 검증을 추가

Assets/_Game/Prefabs/Bosses/Prefab_Boss_BossTemplate.prefab

@@ -20,7 +20,6 @@ GameObject:
   - component: {fileID: 11400005}
   - component: {fileID: 11400006}
   - component: {fileID: 3792588902782784034}
-  - component: {fileID: 9069822911508997612}
   m_Layer: 0
   m_Name: Prefab_Boss_BossTemplate
   m_TagString: Untagged
@@ -291,23 +290,3 @@ MonoBehaviour:
   SwitchTransformSpaceWhenParented: 0
   Interpolate: 1
   SlerpPosition: 0
---- !u!114 &9069822911508997612
-MonoBehaviour:
-  m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 100000}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: e8d0727d5ae3244e3b569694d3912374, type: 3}
-  m_Name: 
-  m_EditorClassIdentifier: Unity.Netcode.Runtime::Unity.Netcode.Components.NetworkAnimator
-  ShowTopMostFoldoutHeaderGroup: 1
-  NetworkAnimatorExpanded: 0
-  AuthorityMode: 0
-  m_Animator: {fileID: 9500000}
-  TransitionStateInfoList: []
-  AnimatorParameterEntries:
-    ParameterEntries: []
-  AnimatorParametersExpanded: 0