i18n: fix unnatural Japanese expressions in machine-translated documentation

[yahonda]

This PR fixes several unnatural and incorrect Japanese expressions in the machine-translated documentation for the release-8.5 branch.

Key Changes Summary

1. Technical Terminology Normalization

• Transaction: Replaced '取引' with 'トランザクション'
• Views: Replaced '閲覧数' with 'ビュー'
• Configuration: Replaced 'コンフィグレーション' with '設定' (Settings/Configuration)
• Garbage Collection: Replaced 'ごみ収集' with 'ガベージコレクション'
• Migration: Replaced '移住' with '移行'
• Stale Read: Replaced '古い読み取り' with 'ステイル読み取り'
• Storage: Replaced 'storage' and '保管所' with 'ストレージ' (while preserving technical configuration keys like readpool.storage)
• Partition Table: Replaced '仕切りテーブル' with 'パーティションテーブル'
• Resolved-TS: Replaced '解決済み-TS' with 'resolved-ts'
• Literal Values: Replaced '文字通りの値' with 'リテラル値'
• Auto Random: Replaced '自動乱数' with 'AUTO_RANDOM'
• Expression Index: Replaced '発見指数' with '式インデックス'

2. Component & Keyword Protection

Restored English names or standard technical Katakana for components to prevent over-translation:

• TiKV: Replaced 'ティクヴ' with 'TiKV'
• Raft: Replaced 'いかだ' with 'Raft', 'いかだエンジン' with 'Raft Engine', 'いかだ屋' with 'Raftstore'
• TiDB Tools: Replaced '団子' with 'Dumpling', 'ポンプ' with 'Pump', 'ドレイナー/水切り' with 'Drainer', 'レパロ' with 'Reparo'
• AI Integrations: Replaced 'アマゾンTitan' with 'Amazon Titan', '調和する' with 'Cohere', 'ジナAI' with 'Jina AI'
• Ecosystem: Replaced '自作' with 'Homebrew', 'ジャワ' with 'Java', 'ゴラン' with 'Golang', '光CP' with 'HikariCP', 'ドルイド' with 'Druid'
• Other: Replaced 'わたし' with 'IAM' (where applicable), '成分' with 'コンポーネント', '建築' with 'アーキテクチャ', 'クリック率' with 'CTR'

3. Role Name Refinement

• Learner: Standardized to 'ラーナー' (Katakana) in descriptive text, while keeping AddLearner and PromoteLearner in English when used as technical identifiers.
• Normalization: Normalized 'クラスタ' to 'クラスター' (long vowel) and ensured consistent use of 'リーダー', 'フォロワー'.

4. UI & Phrasing Improvements

• GitHub: Replaced 'GitHubでビュー' with 'GitHubで確認'
• Navigation: Replaced '探求しよう/探索する' with more idiomatic '基本操作/確認/入門'
• Multi-DC: Standardized 'Multiple Data Centers in One City Deployment' to '1 つの地域に配置された複数のデータセンター' for better readability.
• Product Name: Unified 'TiDBセルフマネージド' to 'TiDB Self-Managed'.

These changes significantly improve the readability and technical accuracy of the Japanese documentation by aligning machine-translated content with industry standards.

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[gemini-code-assist]

Code Review

This pull request performs a comprehensive terminology cleanup across the Japanese documentation to improve consistency and technical accuracy. Key updates include standardizing terms such as 'transaction' to 'トランザクション', 'view' to 'ビュー', 'configuration' to '設定', and 'storage' to 'ストレージ', while also ensuring product names like 'Titan' and 'Pump' are used correctly. Feedback from the review identifies a few remaining translation issues, specifically correcting the translation of 'Exchange operator' and ensuring that headings for SQL basic operations and HTAP introductions align with the Table of Contents for better navigability.

[yahonda]

All feedback from @gemini-code-assist[bot] has been addressed, including heading consistency, exchange operator terminology, and natural phrasing improvements.