fix: correct translated anchor fragments in zh/ja datasource-plugin

[RiskeyL]

Summary

Fix four broken anchors flagged by the CI internal link check (tools/check-links.py --internal) in the zh and ja datasource-plugin pages.

These pages link to tool-plugin section headings. The translation pipeline translated the link labels but left the anchor fragments in English (#4-prepare-tool-code, #2-complete-third-party-service-credentials). Because the zh/ja tool-plugin headings are translated, their generated slugs are localized, so the English fragments resolved to nonexistent anchors. The en page passed because its headings stay in English, which is why this only surfaced in the translated files.

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Project	Status	Preview	Updated (UTC)
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[Copilot]

Pull request overview

Fixes broken internal anchor links in the Chinese and Japanese datasource-plugin docs by updating link fragments to match the localized heading slugs in the corresponding tool-plugin pages (as generated by the repo’s internal slugify() logic in tools/check-links.py).

Changes:

• Update zh datasource-plugin links to use #4-准备工具代码 and #2-完善第三方服务凭据.
• Update ja datasource-plugin links to use #4-ツールコードの準備 and #2-サードパーティサービス認証情報の完成.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
zh/develop-plugin/dev-guides-and-walkthroughs/datasource-plugin.mdx	Updates two /tool-plugin#... anchor fragments to match the zh tool-plugin heading slugs.
ja/develop-plugin/dev-guides-and-walkthroughs/datasource-plugin.mdx	Updates two /tool-plugin#... anchor fragments to match the ja tool-plugin heading slugs.

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