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/Database/DTO/SidekickSpecies.cs

@@ -0,0 +1,116 @@
+// 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 SQLite;
+using System;
+using System.Collections.Generic;
+
+namespace Synty.SidekickCharacters.Database.DTO
+{
+    [Table("sk_species")]
+    public class SidekickSpecies
+    {
+        [PrimaryKey, AutoIncrement, Column("id")]
+        public int ID { get; set; }
+        [Column("name")]
+        public string Name { get; set; }
+        [Column("code")]
+        public string Code { get; set; }
+
+        /// <summary>
+        ///     Gets a list of all the Species in the database.
+        /// </summary>
+        /// <param name="dbManager">The Database Manager to use.</param>
+        /// <param name="excludeSpeciesWithNoParts">Whether to excludes species that have no active parts</param>
+        /// <returns>A list of all species in the database.</returns>
+        public static List<SidekickSpecies> GetAll(DatabaseManager dbManager, bool excludeSpeciesWithNoParts = true)
+        {
+            List<SidekickSpecies> allSpecies = dbManager.GetCurrentDbConnection().Table<SidekickSpecies>().ToList();
+
+            List<SidekickSpecies> filteredSpecies = allSpecies;
+            if (excludeSpeciesWithNoParts)
+            {
+                filteredSpecies = new List<SidekickSpecies>();
+                foreach (SidekickSpecies species in allSpecies)
+                {
+                    List<SidekickPart> allParts = SidekickPart.GetAllForSpecies(dbManager, species);
+                    if (allParts.Count > 0 || species.Name.Equals("Unrestricted", StringComparison.OrdinalIgnoreCase))
+                    {
+                        filteredSpecies.Add(species);
+                    }
+                }
+            }
+
+            return filteredSpecies;
+        }
+
+        /// <summary>
+        ///     Gets a specific Species by its database ID.
+        /// </summary>
+        /// <param name="dbManager">The Database Manager to use.</param>
+        /// <param name="id">The id of the required Species.</param>
+        /// <returns>The specific Species if it exists; otherwise null.</returns>
+        public static SidekickSpecies GetByID(DatabaseManager dbManager, int id)
+        {
+            return dbManager.GetCurrentDbConnection().Get<SidekickSpecies>(id);
+        }
+
+        /// <summary>
+        ///     Gets a specific Species by its database ID.
+        /// </summary>
+        /// <param name="dbManager">The Database Manager to use.</param>
+        /// <param name="name">The name of the required Species.</param>
+        /// <returns>The specific Species if it exists; otherwise null.</returns>
+        public static SidekickSpecies GetByName(DatabaseManager dbManager, string name)
+        {
+            return dbManager.GetCurrentDbConnection().Table<SidekickSpecies>().FirstOrDefault(species => species.Name.ToLower() == name.ToLower());
+        }
+
+        /// <summary>
+        ///     Updates or Inserts this item in the Database.
+        /// </summary>
+        /// <param name="dbManager">The database manager to use.</param>
+        public int Save(DatabaseManager dbManager)
+        {
+            if (ID < 0)
+            {
+                dbManager.GetCurrentDbConnection().Insert(this);
+                // in theory this could return a different ID, but in practice it's highly unlikely
+                ID = (int) SQLite3.LastInsertRowid(dbManager.GetCurrentDbConnection().Handle);
+            }
+            dbManager.GetCurrentDbConnection().Update(this);
+            return ID;
+        }
+
+        /// <summary>
+        ///     Deletes this item from the database
+        /// </summary>
+        /// <param name="dbManager">The database manager to use.</param>
+        public void Delete(DatabaseManager dbManager)
+        {
+            dbManager.GetCurrentDbConnection().Delete<SidekickSpecies>(ID);
+        }
+
+        /// <inheritdoc cref="Equals"/>
+        public override bool Equals(object obj)
+        {
+            SidekickSpecies species = (SidekickSpecies) obj;
+            if (ID > 0 && species?.ID > 0)
+            {
+                return ID == species?.ID;
+            }
+
+            return Name.Equals(species?.Name);
+        }
+
+        /// <inheritdoc cref="GetHashCode"/>
+        public override int GetHashCode()
+        {
+            return HashCode.Combine(ID, Name, Code);
+        }
+    }
+}