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/SidekickSpeciesImage.cs

@@ -0,0 +1,115 @@
+// 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.Collections.Generic;
+
+namespace Synty.SidekickCharacters.Database.DTO
+{
+    [Table("sk_species_image")]
+    public class SidekickSpeciesImage
+    {
+        private SidekickSpecies _species;
+
+        [PrimaryKey, AutoIncrement, Column("id")]
+        public int ID { get; set; }
+        [Column("ptr_species")]
+        public int PtrSpecies { get; set; }
+        [Column("img_data")]
+        public byte[] ImageData { get; set; }
+        [Column("img_width")]
+        public int Width { get; set; }
+        [Column("img_height")]
+        public int Height { get; set; }
+
+        [Ignore]
+        public SidekickSpecies Species
+        {
+            get => _species;
+            set
+            {
+                _species = value;
+                PtrSpecies = value.ID;
+            }
+        }
+
+        /// <summary>
+        ///     Gets a specific Species Image by its database ID.
+        /// </summary>
+        /// <param name="dbManager">The Database Manager to use.</param>
+        /// <param name="id">The id of the required Species Image.</param>
+        /// <returns>The specific Species Image if it exists; otherwise null.</returns>
+        public static SidekickSpeciesImage GetByID(DatabaseManager dbManager, int id)
+        {
+            SidekickSpeciesImage speciesImage = dbManager.GetCurrentDbConnection().Find<SidekickSpeciesImage>(id);
+            Decorate(dbManager, speciesImage);
+            return speciesImage;
+        }
+
+        /// <summary>
+        ///     Gets a list of all the Species Image in the database.
+        /// </summary>
+        /// <param name="dbManager">The Database Manager to use.</param>
+        /// <returns>A list of all species images in the database.</returns>
+        public static List<SidekickSpeciesImage> GetAll(DatabaseManager dbManager)
+        {
+            List<SidekickSpeciesImage> speciesImages = dbManager.GetCurrentDbConnection().Table<SidekickSpeciesImage>().ToList();
+
+            foreach (SidekickSpeciesImage speciesImage in speciesImages)
+            {
+                Decorate(dbManager, speciesImage);
+            }
+
+            return speciesImages;
+        }
+
+        /// <summary>
+        ///     Gets the Species Image in the database that has the matching Species.
+        /// </summary>
+        /// <param name="dbManager">The Database Manager to use.</param>
+        /// <param name="species">The species to get the species image for.</param>
+        /// <returns>The species image in the database for the given species.</returns>
+        public static SidekickSpeciesImage GetBySpecies(DatabaseManager dbManager, SidekickSpecies species)
+        {
+            SidekickSpeciesImage partPresetImage = dbManager.GetCurrentDbConnection().Table<SidekickSpeciesImage>()
+                .FirstOrDefault(presetPart => presetPart.PtrSpecies == species.ID);
+
+            if (partPresetImage != null)
+            {
+                Decorate(dbManager, partPresetImage);
+            }
+
+            return partPresetImage;
+        }
+
+        /// <summary>
+        ///     Ensures that the given preset has its nice DTO class properties set
+        /// </summary>
+        /// <param name="dbManager">The Database Manager to use.</param>
+        /// <param name="bodyShapePresetImage">The color preset to decorate</param>
+        /// <returns>A color set with all DTO class properties set</returns>
+        private static void Decorate(DatabaseManager dbManager, SidekickSpeciesImage bodyShapePresetImage)
+        {
+            bodyShapePresetImage.Species ??= SidekickSpecies.GetByID(dbManager, bodyShapePresetImage.PtrSpecies);
+        }
+
+        /// <summary>
+        ///     Updates or Inserts this item in the Database.
+        /// </summary>
+        /// <param name="dbManager">The database manager to use.</param>
+        public void 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);
+        }
+    }
+}