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/Plugins/unity-sqlite-net-1.2.4/Runtime/sqlite-net/AssemblyInfo.cs

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+using System.Resources;
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("SQLite-net Official Portable Library")]
+[assembly: AssemblyDescription("Light weight library providing easy SQLite database storage")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("Krueger Systems, Inc.")]
+[assembly: AssemblyProduct("SQLite-net")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+[assembly: NeutralResourcesLanguage("en")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Assets/External/Models/SidekickCharacters/Plugins/unity-sqlite-net-1.2.4/Runtime/sqlite-net/AssemblyInfo.cs.meta

@@ -0,0 +1,11 @@
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+guid: 5c9be88643c0c40be8577f5969655b43
+MonoImporter:
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+  serializedVersion: 2
+  defaultReferences: []
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+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/External/Models/SidekickCharacters/Plugins/unity-sqlite-net-1.2.4/Runtime/sqlite-net/LICENSE.txt

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+Copyright (c) Krueger Systems, Inc.
+
+All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Assets/External/Models/SidekickCharacters/Plugins/unity-sqlite-net-1.2.4/Runtime/sqlite-net/LICENSE.txt.meta

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+  assetBundleName: 
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Assets/External/Models/SidekickCharacters/Plugins/unity-sqlite-net-1.2.4/Runtime/sqlite-net/SQLite.cs.meta

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Assets/External/Models/SidekickCharacters/Plugins/unity-sqlite-net-1.2.4/Runtime/sqlite-net/SQLiteAsync.cs.meta

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