i18n(ja): unify inconsistent proxy account term in SQL Proxy Account doc

[yahonda]

What is changed, added or deleted? (Required)

tidb-cloud/sql-proxy-account.md has 4 "No proxy account" entries in the SQL proxy account role table. One of them (Organization Billing Manager) used a different Japanese term (代理アカウント, a generic substitute/proxy word) than its 3 sibling entries and the rest of the document (プロキシアカウント, matching the established SQL proxy account terminology used consistently everywhere else in this file). Unified it to プロキシアカウント.

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• 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)

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• Delete files
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• Might cause conflicts after applied to another branch

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Timeline:

• 2026-08-17 09:13:53.825680612 +0000 UTC m=+3642619.861775688: ☑️ agreed by qiancai.