[Translations] Japanese ja_JP - Chapter 9

[nwiizo]

📝 Description

Continues work on #61
/kind documentation

Dear @salaboy and the exceptional platforms-on-k8s team,

I hope this message finds you well. As we approach the final stages of our translation project, I want to express my deep gratitude for your unwavering support and invaluable feedback throughout this journey. Your dedication has been instrumental in bringing us this far. 🙏

With great pleasure, I present the Japanese translation for Chapter 9 of the "Platforms on Top of Kubernetes" book. While this marks a significant milestone, I want to inform you that there are still a few additional tasks we need to address to fully complete the project. 📚

I understand that reviewing these consecutive PRs has been a substantial commitment, and I truly appreciate your patience and diligence. As we move forward with the remaining tasks, your continued support will be invaluable. 🙇‍♂️

🔄 Changes

• ➕ Integrated Chapter 9 content into README-ja.md
• 🔍 Ensured consistency in formatting and style with both the original English version and all previous translations
• 🔄 Updated the table of contents in README-ja.md to include Chapter 9

📌 Notes

• 🎯 As with all previous chapters, I've maintained a balance between accuracy and natural Japanese expression
• 🌏 This translation continues to expand the resources available to the Japanese-speaking Kubernetes and cloud-native community
• 💬 I warmly welcome any feedback or suggestions for improvement, which will be crucial as we approach the project's completion
• 🚀 I will be working on the remaining tasks, including [brief description of additional tasks], and will keep you updated on the progress

I cannot thank you enough for your continued support and the time you've invested in reviewing these translations. Your expertise has been vital in bringing this valuable resource to the Japanese-speaking audience. I look forward to your guidance as we work through the final stages of this project. ✨

Thank you for your ongoing patience and support as we move towards the full completion of the "Platforms on Top of Kubernetes" Japanese translation. 🙏