i18n(ja): recipe/build custom img component

[Kenzo-Wada]

Description (required)

japanese translation for /recipes/build-custom-img-component/

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ja/recipes/build-custom-img-component.mdx	Localization added, will be marked as complete.

Warnings reference

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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[Copilot]

Pull Request Overview

This PR adds Japanese translation for the "Build Custom Image Component" recipe documentation, providing Japanese-speaking developers with localized content for creating custom image components using Astro's getImage() function.

• Added complete Japanese translation for the custom image component recipe
• Translated technical concepts and code examples into Japanese
• Maintained all original functionality and code structure with Japanese comments and descriptions

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[yanthomasdev]

LGTM! Thanks!