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/Network/UrlManager.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 System.Collections.Generic;
+using System.Net;
+using UnityEngine.Networking;
+
+namespace Synty.SidekickCharacters.Network
+{
+    /// <summary>
+    ///     Manages all URLs used in the application to communicate with the Synty API.
+    /// </summary>
+    internal static class UrlManager
+    {
+        // Base URL
+        private const string _BASE_URL = "https://api.syntystudios.com/";
+
+        // API version we're connecting to
+        private const int _API_VERSION = 1;
+
+        // API URLs
+        private const string _API_GET_DB_UPDATE = "sidekick-database";
+
+        /// <summary>
+        ///     Creates a new POST request built from the provided URL and form data with the api key added into the header if required.
+        /// </summary>
+        /// <param name="url">The URL to attach the post request to.</param>
+        /// <param name="formData">Any form data to attach to the request.</param>
+        /// <param name="apiKey">The api key to use, if required.</param>
+        /// <returns>A <c>UnityWebRequest.POST</c> with the given details.</returns>
+        public static UnityWebRequest CreatePostRequest(string url, List<IMultipartFormSection> formData, string apiKey = "")
+        {
+            UnityWebRequest webRequest = UnityWebRequest.Post(url, formData);
+            if (apiKey != "")
+            {
+                webRequest.SetRequestHeader("Authorization", "Bearer " + apiKey);
+            }
+
+            return webRequest;
+        }
+
+        /// <summary>
+        ///     Creates a new GET request built from the provided URL with the api key added into the header if required.
+        /// </summary>
+        /// <param name="url">The URL to attach the post request to.</param>
+        /// <param name="apiKey">The api key to use, if required.</param>
+        /// <returns>A <c>UnityWebRequest.GET</c> with the given details.</returns>
+        public static UnityWebRequest CreateGetRequest(string url, string apiKey = "")
+        {
+            UnityWebRequest webRequest = UnityWebRequest.Get(url);
+            if (apiKey != "")
+            {
+                webRequest.SetRequestHeader("Authorization", "Bearer " + apiKey);
+            }
+
+            return webRequest;
+        }
+
+        /// <summary>
+        ///     Returns the base API URL.
+        /// </summary>
+        /// <returns>The base API URL.</returns>
+        private static string GetBaseUrl()
+        {
+            return _BASE_URL + "api/v" + _API_VERSION + "/";
+        }
+
+        /// <summary>
+        ///     Gets the Sidekick DB update URL.
+        /// </summary>
+        /// <returns>The Sidekick DB URL.</returns>
+        public static string GetDbUpdateUrl()
+        {
+            // TODO : do we still need this encoding?
+            // As this URL contains "unsafe" characters, we encode them first.
+            return GetBaseUrl() + WebUtility.UrlEncode(_API_GET_DB_UPDATE);
+        }
+    }
+}
+#endif

Assets/External/Models/SidekickCharacters/Scripts/Editor/Network/UrlManager.cs.meta

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+fileFormatVersion: 2
+guid: 49e26bea33a6414183d894f7dd6f0db0
+timeCreated: 1715237455