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/Editor/UI/DatabaseUpdateController.cs

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+// 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.
+
+namespace Synty.SidekickCharacters
+{
+    public class DatabaseUpdateController
+    {
+        // This class is no longer required, and will be deleted in the future.
+        // Included as an empty class to remove code dependencies to allow for deletion without causing project errors.
+    }
+}

Assets/External/Models/SidekickCharacters/Scripts/Editor/UI/DatabaseUpdateController.cs.meta

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Assets/External/Models/SidekickCharacters/Scripts/Editor/UI/MenuBootstrapController.cs

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+// 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.
+
+#if UNITY_EDITOR
+
+using UnityEditor;
+using UnityEngine;
+
+namespace Synty.SidekickCharacters.UI
+{
+    [InitializeOnLoad]
+    public static class MenuBootstrapController
+    {
+        private const string _AUTO_OPEN_STATE = "syntySkAutoOpenState";
+        private const string _PREFS_CHECK_NAME = "syntySKCheckDependencies";
+
+        private static ModularCharacterWindow _sidekickCharacterWindow;
+        private static bool _openWindowOnStart = true;
+
+        static MenuBootstrapController()
+        {
+            EditorApplication.update += OpenWindowOnStartup;
+        }
+
+        /// <summary>
+        ///     Opens the Character Creator window when Unity starts or the plugin is added to a project.
+        /// </summary>
+        private static void OpenWindowOnStartup()
+        {
+            _openWindowOnStart = EditorPrefs.GetBool(_AUTO_OPEN_STATE, true);
+            EditorApplication.update -= OpenWindowOnStartup;
+            if (_openWindowOnStart)
+            {
+                if (!SessionState.GetBool("FirstInitDone", false))
+                {
+                    ShowSidekickCharacterWindow();
+          
+                    SessionState.SetBool("FirstInitDone", true);
+                }
+                
+            }
+        }
+
+        /// <summary>
+        ///     Creates the Sidekick Character Creator window and adds it to the toolbar.
+        /// </summary>
+        [MenuItem("Synty/Sidekick Character Tool")]
+        public static void ShowSidekickCharacterWindow()
+        {
+            FindSidekickCharacterWindow();
+            _sidekickCharacterWindow.Show();
+        }
+
+        /// <summary>
+        ///     Find the existing Sidekick Character Creator window, or create one if it doesn't exist
+        /// </summary>
+        private static void FindSidekickCharacterWindow()
+        {
+            if (_sidekickCharacterWindow != null)
+            {
+                return;
+            }
+
+            _sidekickCharacterWindow = EditorWindow.GetWindow<ModularCharacterWindow>("Sidekick Character Tool");
+            _sidekickCharacterWindow.minSize = new Vector2(600, 600);
+        }
+    }
+}
+#endif

Assets/External/Models/SidekickCharacters/Scripts/Editor/UI/MenuBootstrapController.cs.meta

@@ -0,0 +1,3 @@
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Assets/External/Models/SidekickCharacters/Scripts/Editor/UI/PartTypeControls.cs

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+// 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 Synty.SidekickCharacters.Enums;
+using System.Collections.Generic;
+using UnityEditor.UIElements;
+using UnityEngine;
+using UnityEngine.UIElements;
+
+namespace Synty.SidekickCharacters.Synty.SidekickCharacters.Scripts.Editor.UI
+{
+    public class PartTypeControls
+    {
+        public CharacterPartType PartType;
+        public Button ClearButton;
+        public Button PreviousButton;
+        public Button NextButton;
+        public Button RandomButton;
+        public PopupField<string> PartDropdown;
+
+        public PartTypeControls()
+        {
+        }
+
+        public PartTypeControls(CharacterPartType partType, Button clearButton, Button previousButton, Button nextButton, Button randomButton, PopupField<string> partDropdown)
+        {
+            PartType = partType;
+            ClearButton = clearButton;
+            PreviousButton = previousButton;
+            NextButton = nextButton;
+            RandomButton = randomButton;
+            PartDropdown = partDropdown;
+        }
+
+        public void UpdateControls()
+        {
+            PartDropdown.SetEnabled(PartDropdown.choices.Count > 0);
+
+            if (PartType != CharacterPartType.Wrap)
+            {
+                ClearButton.SetEnabled(PartDropdown.value != "None");
+            }
+            else
+            {
+                ClearButton.SetEnabled(false);
+                if (string.IsNullOrEmpty(PartDropdown.value))
+                {
+                    PartDropdown.SetEnabled(false);
+                }
+            }
+
+            if (PartDropdown.choices.Count > 1)
+            {
+                PreviousButton.SetEnabled(PartDropdown.index >= 1);
+
+                NextButton.SetEnabled(PartDropdown.index < PartDropdown.choices.Count - 1);
+            }
+            else
+            {
+                PreviousButton.SetEnabled(false);
+                NextButton.SetEnabled(false);
+            }
+
+            RandomButton.SetEnabled(PartDropdown.choices.Count > 2);
+        }
+
+        public void UpdateDropdownValues(List<string> newValues)
+        {
+            PartDropdown.choices = newValues;
+            PartDropdown.MarkDirtyRepaint();
+        }
+
+        public void SetPartDropdownValue(string value)
+        {
+            PartDropdown.value = value;
+        }
+
+        public void RandomisePartDropdownValue()
+        {
+            int lowValue = PartType == CharacterPartType.Wrap ? 0 : 1;
+            PartDropdown.index = Random.Range(lowValue, PartDropdown.choices.Count);
+        }
+    }
+}

Assets/External/Models/SidekickCharacters/Scripts/Editor/UI/PartTypeControls.cs.meta

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