[i18n] ja translations developer architecture Service Workers and Scopes

[shimotmk]

Motivation for the change, related issues

Part of #2202

Add Japanese translations to Service Workers and Scopes

[Copilot]

Pull request overview

Adds Japanese (ja) translations for the “Service Workers” and “Scopes” architecture docs as part of #2202.

Changes:

• Added ja translation page for browser service workers, including code examples.
• Added ja translation page for browser scopes, including worker initialization example.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
packages/docs/site/i18n/ja/docusaurus-plugin-content-docs/current/developers/23-architecture/13-browser-scopes.md	Adds Japanese translation for the “Scopes” doc page.
packages/docs/site/i18n/ja/docusaurus-plugin-content-docs/current/developers/23-architecture/12-browser-service-workers.md	Adds Japanese translation for the “Service Workers” doc page (with setup examples).

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

The doc references two different service worker script paths: "/sw.js" in the registration example vs /service-worker.js in the text and filename label. This is confusing for readers and makes the setup steps ambiguous. Use a single consistent filename/path across the snippet and the surrounding explanation (either update the registration example to "/service-worker.js" or change the later references to /sw.js).

[fellyph]

Thanks @shimotmk!