docs(readme): TS7・ツールチェーンに合わせて古い記載を更新

[sasagar]

概要

README の古い情報を現状に合わせて更新します。

• TypeScript バッジ 5.x → 7.x(ネイティブコンパイラへ移行済み)
• テストバッジ 800+ → 1000+(現在 1012 ユニットテスト)
• スクリプト説明: oxlint → vp (oxc)(lint / format)

README.md / README.ja.md の両方を更新。

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 039dfd83-6bf8-46a8-b507-3719a592dacf

📥 Commits

Reviewing files that changed from the base of the PR and between b455658 and 8d2c24d.

📒 Files selected for processing (2)

• README.ja.md
• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/readme-ts7

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