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/Utils/SampleAutoInputModule.cs

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+// Copyright (c) 2025 Synty Studios Limited. All rights reserved.
+//
+// Use of this software is subject to the terms and conditions of the End User Licence Agreement (EULA)
+// of the store at which you purchased this asset.
+//
+// Synty assets are available at:
+// https://www.syntystore.com
+// https://assetstore.unity.com/publishers/5217
+// https://www.fab.com/sellers/Synty%20Studios
+//
+// Sample scripts are included only as examples and are not intended as production-ready.
+
+using UnityEngine;
+using UnityEngine.EventSystems;
+
+#if ENABLE_INPUT_SYSTEM
+using UnityEngine.InputSystem;
+// compile errors?
+using UnityEngine.InputSystem.UI;
+// compile errors?
+// if you are getting a compile error here you likely need to import the Input System package (com.unity.inputsystem) in the package manager or change the input setting in player settings back to 'Input Manager (Old)'
+#endif
+
+
+namespace Synty.SidekickCharacters.Utils
+{
+    /// <summary>
+    ///     Sample script that helps automatically select the correct input event module depending on your project's settings.
+    /// </summary>
+    [ExecuteAlways]
+    [RequireComponent(typeof(EventSystem))]
+    public class SampleAutoInputModule : MonoBehaviour
+    {
+        void OnEnable()
+        {
+            UpdateInputModule();
+        }
+
+        void UpdateInputModule()
+        {
+#if ENABLE_INPUT_SYSTEM
+            // New Input System only
+            if (GetComponent<InputSystemUIInputModule>() == null)
+            {
+                // Remove any existing modules
+                foreach (var module in GetComponents<BaseInputModule>())
+                {
+                    DestroyImmediate(module);
+                }
+                gameObject.AddComponent<InputSystemUIInputModule>();
+                if(!Application.isPlaying) Debug.Log("Added InputSystemUIInputModule (new input system)");
+            }
+#elif ENABLE_LEGACY_INPUT_MANAGER
+            // Old Input Manager only
+            if (GetComponent<StandaloneInputModule>() == null)
+            {
+                // Remove any existing modules
+                foreach (var module in GetComponents<BaseInputModule>())
+                {
+                    DestroyImmediate(module);
+                }
+                gameObject.AddComponent<StandaloneInputModule>();
+                if(!Application.isPlaying) Debug.Log("Added StandaloneInputModule (old input manager)");
+            }
+#else
+            Debug.LogWarning("No input system enabled in project settings.");
+#endif
+        }
+    }
+}