Synchronize structural changes from English source files (.en.md) to
Japanese translated files (.md) following the update-origin-21.0.0 migration.

Changes include:
- Code block syntax standardization (docs-code → markdown fences)
- List marker unification (* → -)
- Italic syntax standardization (*text* → _text_)
- Heading anchor ID additions
- Table formatting improvements
- New content sections translation
- Textlint error corrections

All changes preserve existing Japanese translations while maintaining
exact line count correspondence with English source files.

Synchronize structural changes from English source files to Japanese
translated files for TypeScript, HTML, and JSON files.

Changes include:
- HTML template formatting and accessibility improvements
- Component refactoring (HostListener to host bindings)
- Navigation data updates for v21 features
- New recommendation entries
- Tutorial configuration updates
- Japanese translation of all navigation labels

All changes preserve existing Japanese translations while applying
structural improvements from the upstream codebase.

- Fix redundant expression in host-elements.md
- Fix prh terminology in define-routes.md (インジェクションコンテキスト → 注入コンテキスト)
- Fix spacing issues in utility-apis.md

The header.service.ts file was inadvertently left without
localization after removing replace-canonical-host.patch.
This patch ensures ANGULAR_DEV constant is set to angular.jp.

Added anchor IDs to 11 level-2 and level-3 headings to ensure
cross-reference compatibility with internal links.

Changed headings:
- ## Angular のバージョン管理 {#angular-versioning}
- ### プレビューリリース {#preview-releases}
- ## リリース頻度 {#release-frequency}
- ## サポートポリシーとスケジュール {#support-policy-and-schedule}
- ### リリーススケジュール {#release-schedule}
- ### サポート期間 {#support-window}
- ### アクティブにサポートされているバージョン {#actively-supported-versions}
- ### LTSの修正 {#lts-fixes}
- ## 互換性ポリシー {#compatibility-policy}
- ## 破壊的変更ポリシーと更新パス {#breaking-change-policy-and-update-paths}
- ## 実験的 {#experimental}

This resolves anchor link validation errors like the one for
#deprecation-policy and maintains consistency with English version.

- Add anchor ID to "ルートガードの種類" in route-guards.md
- Add anchor IDs to all section headings in versions.md

…tion.md

…y-injection.md

…on.md

…es.md

…iew.md

…s/overview.md

…os.md