Translate "fundamentals/persist-data-volumes" documents into Japanese

[takashiuesaka]

fixed #467

[Copilot]

Pull request overview

This PR adds a complete Japanese translation of the "fundamentals/persist-data-volumes" documentation page. The translation covers key concepts around using Docker volumes and bind mounts to persist data across Aspire application restarts, including detailed explanations of when to persist data, differences between volumes and bind mounts, code examples, and persistent password configuration.

Changes:

• Adds Japanese translation of the persist-data-volumes documentation with proper localization of all content
• Maintains all code examples in their original form with appropriate Japanese explanatory text
• Properly localizes all internal documentation links with /ja/ prefix

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