CI/CDテストとテスト関連ファイルの削除

[GOROman]

変更内容\n\n- CI/CD関連の設定とテスト関連ファイルをすべて削除\n- package.jsonからテスト関連のスクリプトと依存関係を削除\n- Jest設定ファイルを削除\n- すべてのテストディレクトリ（tests）を削除\n\n## 理由\n\nテスト環境の簡素化と開発効率の向上のため

[Copilot]

Pull Request Overview

This PR removes all CI/CD and test-related files and configurations to streamline the development environment. Key changes include modifying the AppError constructor in src/utils/errors.ts, updating type annotations in src/middleware/filter-middleware.ts, and deleting numerous test files across the project.

Reviewed Changes

Copilot reviewed 19 out of 20 changed files in this pull request and generated 1 comment.

File	Description
src/utils/errors.ts	Modifies the AppError constructor to accept either a string code or metadata object; however, a duplicate assignment may override the intended metadata value.
src/middleware/filter-middleware.ts	Updates type annotations by replacing type aliases with interfaces and using “unknown” instead of “any”.
Various tests directories/files	Deletes test files and related configurations from CI/CD and test infrastructure.

Files not reviewed (1)

• package.json: Language not supported

[Copilot]

This assignment overwrites the metadata set in the conditional block above. Consider removing this duplicate assignment to ensure the intended metadata value is preserved.