chore: Assets 디렉토리 구조 정리 및 네이밍 컨벤션 적용

- Assets/_Game/ 하위로 게임 에셋 통합
- External/ 패키지 벤더별 분류 (Synty, Animations, UI)
- 에셋 네이밍 컨벤션 확립 및 적용
  (Data_Skill_, Data_SkillEffect_, Prefab_, Anim_, Model_, BT_ 등)
- pre-commit hook으로 네이밍 컨벤션 자동 검사 추가
- RESTRUCTURE_CHECKLIST.md 작성

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

Assets/External/Models/SidekickCharacters/Scripts/Runtime/SkinnedMesh/BlendShapeData.cs

@@ -0,0 +1,60 @@
+// Copyright (c) 2024 Synty Studios Limited. All rights reserved.
+//
+// Use of this software is subject to the terms and conditions of the Synty Studios End User Licence Agreement (EULA)
+// available at: https://syntystore.com/pages/end-user-licence-agreement
+//
+// For additional details, see the LICENSE.MD file bundled with this software.
+
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Synty.SidekickCharacters.SkinnedMesh
+{
+    /// <summary>
+    ///     Wrapper class to hold information about a given blendshape.
+    /// </summary>
+    public class BlendShapeData
+    {
+        public string blendShapeFrameName = "";
+        public int blendShapeFrameIndex = -1;
+        public float blendShapeCurrentValue = 0.0f;
+        public List<Vector3> startDeltaVertices = new List<Vector3>();
+        public List<Vector3> startDeltaNormals = new List<Vector3>();
+        public List<Vector3> startDeltaTangents = new List<Vector3>();
+        public List<Vector3> finalDeltaVertices = new List<Vector3>();
+        public List<Vector3> finalDeltaNormals = new List<Vector3>();
+        public List<Vector3> finalDeltaTangents = new List<Vector3>();
+        public string blendShapeNameOnCombinedMesh = "";
+
+        protected bool Equals(BlendShapeData other)
+        {
+            return blendShapeFrameName.Equals(other.blendShapeFrameName, StringComparison.OrdinalIgnoreCase);
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (ReferenceEquals(null, obj))
+            {
+                return false;
+            }
+
+            if (ReferenceEquals(this, obj))
+            {
+                return true;
+            }
+
+            if (obj.GetType() != this.GetType())
+            {
+                return false;
+            }
+
+            return Equals((BlendShapeData) obj);
+        }
+
+        public override int GetHashCode()
+        {
+            return (blendShapeFrameName != null ? blendShapeFrameName.GetHashCode() : 0);
+        }
+    }
+}