Exclude parallel route segments (@) from URL paths

[nayukata]

Types of changes

• Bug fixes
• Features
• Maintenance
• Documentation

resolves Support for Next.js parallel routes #XXX

Changes

Added support for Next.js parallel routes by excluding @ segments from URL paths.
Next.jsのパラレルルートに対応し、URLパスから@セグメントを除外するように変更

Additional context

[ja]
Next.jsのパラレルルート（例：@modal, @auth）がURLパスに含まれてしまう問題を修正しました。
例えば、domain/@modal/modal-aのようなパスがdomain/modal-aとして正しく出力されるようになります。

[en]
Fixed an issue where Next.js parallel route segments (e.g., @modal, @auth) were incorrectly included in URL paths.
For example, paths like domain/@modal/modal-a will now correctly output as domain/modal-a.

Reference: See Parallel Routes documentation: https://nextjs.org/docs/app/building-your-application/routing/parallel-routes

Community note

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[solufa]

LGTM