feat: ゲームシーンアーキテクチャのドキュメントを追加し、レイヤー定義と依存方向を明確化

feat: add ESLint rule to prefer relative imports for local client paths ...

- Introduced a new ESLint rule that warns when the @client alias is used for imports that can be expressed as relative paths.
- Added a configuration file for ESLint to integrate the new rule and set it to warn level for TypeScript files.