i18n(ja): restore English command and flag names in tiup/ticloud headings

[yahonda]

What is changed, added or deleted? (Required)

The machine-translation pipeline translated literal command names and CLI flag names inside headings in the tiup/ticloud command-reference docs. These must stay English (they are literal commands/flags). This PR restores them to the exact English literal from upstream/release-8.5, leaving the existing {#...} anchors untouched.

32 headings / 22 files.

• Command H1 (11): tiup dm デプロイ/破壊/プルーン/再起動/スタート → deploy/destroy/prune/restart/start; tiup クラスタメタバックアップ/リストア → tiup cluster meta backup/restore; tiup cluster auditクリーンアップ → audit cleanup; ticloud認証ログイン/の完了/ヘルプ → ticloud auth login/completion/help.
• Flag headings (21): --パスワード/--はい/--バージョン/--説明/--スタンドアロン/--毎晩/--保持日数/--稼働時間/--ステータスタイムアウト/--クリーン証明書/--証明書を再読み込み/--再起動タイムアウト/---アップグレード前(後)スクリプト/--ノード(ロール)データを保持 → --password/--yes/--version/--desc/--standalone/--nightly/--retain-days/--uptime/--status-timeout/--clean-certificate/--reload-certificate/--restart-timeout/---pre(post)-upgrade-script/--retain-node(role)-data.

Only the visible heading text is changed; anchors are preserved so inbound links keep resolving. Each heading was verified 1:1 against the English source.

Note: 3 flag headings in tiup-component-cluster-upgrade.md (restart-timeout, pre/post-upgrade-script) also have their anchors adjusted by #23316; these will combine cleanly at merge (text here + anchor there).

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

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)

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

Same class as #23394 (CLI flag tables) and #23400 (SQL identifiers).

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
• This PR was created with the assistance of an AI agent.

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