i18n(ja): use English for config category headings and TiDB Cloud Clinic

[yahonda]

What is changed, added or deleted? (Required)

Fix two issues:

1. Configuration category headings in English (tidb-configuration-file.md)

   Config category names (like performance, log, security) are configuration key prefixes, not prose descriptions. They should be in English to match the actual config file syntax. Fixed 10 headings:

   • パフォーマンス → performance
   • ログ → log
   • ログファイル → log.file
   • 安全 → security
   • オープントレース → opentracing
   • トランザクションローカルラッチ → txn-local-latches
   • 状態 → status
   • 分離読み取り → isolation-read
   • 実例 → instance
   • プロキシプロトコル → proxy-protocol
   • 実験的 → experimental

2. TiDB Cloudクリニック → TiDB Cloud Clinic (3 files, 8 occurrences)

   "Clinic" is a proper service name and should be in English. Affected files: TOC-tidb-cloud.md, tidb-cloud/tidb-cloud-clinic.md, tidb-cloud/releases/tidb-cloud-release-notes.md.

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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[gemini-code-assist]

Code Review

This pull request standardizes the terminology "TiDB Cloud Clinic" in the Japanese documentation and updates several configuration headings in tidb-configuration-file.md from Japanese translations to their English parameter names (e.g., changing "ログ" to "log"). Feedback was provided to adjust the heading level of log.file to ### to maintain a proper heading hierarchy and prevent jumping directly to level 4 subheadings.

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-06-29 10:44:31.141480492 +0000 UTC m=+36212.841859895: ☑️ agreed by qiancai.