스킬 시스템 구현

- 애니메이션 이벤트 기반 스킬 시스템 추가
  - SkillData: 스킬 데이터 (클립, 쿨타임, 효과 목록)
  - SkillController: 스킬 실행 및 애니메이션 제어
  - AnimatorOverrideController로 단일 State에서 다양한 스킬 재생

- 스킬 효과 시스템
  - DamageEffect, HealEffect, BuffEffect
  - KnockbackEffect, SoundEffect, SpawnEffect
  - 범위 공격 및 팀 구분 지원

- Team 컴포넌트로 아군/적 구분

- 스킬 중 이동 제한
  - IsPlayingAnimation으로 애니메이션 종료까지 이동 불가
  - OnSkillEnd 호출 시 다음 스킬 시전 가능

- 입력 시스템에 스킬 슬롯 6개 추가

- 애니메이션 에셋 추가 및 정리
  - AnimationSwordCombat 패키지 추가 (검 공격 애니메이션)
  - PlayerAnimationController에 Skill 상태 추가
  - External_Used 폴더 구조 정리

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

Assets/External/Tools/SyntyPropBoneTool/Configs/Animation_PropBoneBindingConfig_Default.asset

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   m_Name: Animation_PropBoneBindingConfig_Default
   m_EditorClassIdentifier: 
-  sourceRig: {fileID: 0}
-  targetRig: {fileID: 0}
+  sourceRig: {fileID: 919132149155446097, guid: 68a29e70ae95f6a4195bf0fcbb538019, type: 3}
+  targetRig: {fileID: 919132149155446097, guid: 68a29e70ae95f6a4195bf0fcbb538019, type: 3}
   propBoneDefinitions:
   - parentBoneName: Hand_R
     boneName: Prop_R
     socketName: Prop_R_Socket
     rotationOffset: {x: 0, y: 0, z: 0}
-    scale: 1
+    scalar: 1
     scaleCalculationBone1: Hand_R
     scaleCalculationBone2: Elbow_R

Assets/External/Tools/SyntyPropBoneTool/Configs/Animation_PropBoneBindingConfig_Default.asset.meta

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Assets/External/Tools/SyntyPropBoneTool/Configs/BigRig_01_PropBoneBindingConfig.asset

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   m_EditorClassIdentifier: 
-  sourceRig: {fileID: 919132149155446097, guid: b6b4b9f2696465340b5168dd9e2ca6b3, type: 3}
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     boneName: Prop_R
     socketName: Prop_R_Socket
     rotationOffset: {x: 3.9506698, y: 174.03122, z: 0.034283083}
-    scale: 1.2121843
+    scalar: 1.2121843
     scaleCalculationBone1: Hand_R
     scaleCalculationBone2: Elbow_R

Assets/External/Tools/SyntyPropBoneTool/Configs/KidRig_01_PropBoneBindingConfig.asset

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   targetRig: {fileID: 919132149155446097, guid: f3859a60011274e39a1dd372974c01b8, type: 3}
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     socketName: Prop_R_Socket
-    rotationOffset: {x: 0.0000038260173, y: 0.000004915283, z: 270.14746}
-    scale: 0.5464112
+    rotationOffset: {x: 0.00000041092298, y: 0.000004915283, z: 270.14746}
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     scaleCalculationBone1: Hand_R
     scaleCalculationBone2: Elbow_R

Assets/External/Tools/SyntyPropBoneTool/Configs/POLYGONRig_01_PropBoneBindingConfig.asset

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     boneName: Prop_R
     socketName: Prop_R_Socket
-    rotationOffset: {x: 0.0000038260173, y: 0.000004915283, z: 270.14746}
-    scale: 1
+    rotationOffset: {x: 359.52396, y: 359.89847, z: 269.71255}
+    scalar: 1.0000013
     scaleCalculationBone1: Hand_R
     scaleCalculationBone2: Elbow_R