[ja] Update Service documentation and add Virtual IPs reference

[oromao]

Description

This pull request updates the Japanese documentation for Services and Networking and introduces a new reference page for Virtual IPs.

The update aligns the Japanese localization with the upstream English documentation, incorporating large structural updates, content rewrites, and terminology improvements.

What this PR changes

• Updates content/ja/docs/concepts/services-networking/service.md with the latest upstream content
  • Synchronizes explanations of proxy modes (userspace, iptables, IPVS)
  • Updates diagrams, descriptions, and conceptual flow
  • Ensures accuracy of networking terminology in Japanese
• Adds a new reference document:
  • content/ja/docs/reference/networking/virtual-ips.md
  • Provides a complete explanation of Kubernetes virtual IPs, allocation mechanisms, implementation details, and proxying models
• Fixes outdated phrasing, removes obsolete sections, and restructures content to match upstream
• Maintains glossary consistency and preserves shortcode elements such as feature-state and glossary_tooltip

Why this change is needed

Keeping localized documentation synchronized with upstream is essential for:

• Ensuring Japanese users receive accurate, up-to-date Kubernetes information
• Improving documentation reliability for new contributors and learners
• Maintaining compatibility with current API behavior and networking implementation
• Reducing technical debt in the localization by removing legacy references

This update brings the Service documentation in line with the current Kubernetes reference model and improves translation quality and conceptual consistency.

Issue

Closes: #53415

Signed-off-by: Paulo Sergio Romao Junior [email protected]

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

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[kfess]

Thank you for your interest in contributing.

Before proceeding, please carefully review the Japanese localization style guide (https://kubernetes.io/ja/docs/contribute/localization/) and ensure your translation follows all the guidelines.

Additionally, please note:

• One PR should contain changes to only one file
• All translations must strictly adhere to the style guide

Would you be able to revise this PR accordingly?

[kfess]

@oromao

Please note that this issue is already assigned to another contributor (in this case, it is me).
For future contributions, please check if an issue is assigned before starting work.
We welcome your contributions to other unassigned issues!

[Okabe-Junya]

/hold

#53428 (comment)