docs: add section on security

[jaylinski]

🔒

[Copilot]

🟢 Approval recommended

The changes are documentation-only, links/navigation appear consistent with existing sidebar/base patterns, and no functional or build-breaking issues were found in the updated content.

Pull request overview

Adds a new “Security” guide page to the documentation (English, Korean, and Chinese) and exposes it in the VitePress sidebar so readers can find security guidance alongside the rest of the language guide.

Changes:

• Add new Security guide pages in en, ko, and zh.
• Add “Security” to the Guide sidebar navigation for all three locales.
• Minor line-wrapping/formatting adjustments in existing Chinese guide pages.

File summaries

File	Description
src/zh/guide/security.md	Adds a Chinese Security guide page covering escaping, CSP, server-side rendering risks, and untrusted templates/ASTs.
src/zh/guide/index.md	Adjusts wrapping/formatting in the Block Helpers section.
src/zh/guide/builtin-helpers.md	Adjusts wrapping/formatting in the nested blocks / segment-literal explanation.
src/ko/guide/security.md	Adds a Korean Security guide page covering escaping, CSP, server-side rendering risks, and untrusted templates/ASTs.
src/guide/security.md	Adds the English Security guide page with the same guidance.
src/.vitepress/config.js	Adds “Security” to the Guide sidebar for root, ko, and zh locales.

Review details

• Files reviewed: 6/6 changed files
• Comments generated: 0
• Review effort level: Lite

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