[fix] repair Open Library borrowing page rendering

[dethan3]

Preserve translation resolver functions across SSR serialization and render paragraph Markdown inline to prevent runtime and hydration errors.

Checklist（清单）:

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Closes

Summary by CodeRabbit

• 新功能

  • 优化服务端语言加载，支持更稳定地传递和恢复包含特殊内容的翻译数据。
  • 改进国际化数据初始化流程，提升页面语言显示的一致性。

• 改进

  • 优化“如何借阅”页面的说明文字与流程步骤展示，改善内联 Markdown 内容的渲染效果。

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 1d9265b4-9d3d-4703-ba43-00e9310499db

📥 Commits

Reviewing files that changed from the base of the PR and between cd2371d and 5a63443.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml, !pnpm-lock.yaml and included by none

📒 Files selected for processing (2)

• models/Translation.ts
• pages/open-library/how-to-borrow.tsx

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📝 Walkthrough

Walkthrough

本次变更调整 SSR 国际化数据的序列化与反序列化流程，并将借阅页面的模型介绍及流程描述改为 Markdown 内联解析。

Changes

国际化与借阅页面渲染

Layer / File(s)	Summary
SSR 国际化数据序列化 models/Translation.ts	显式引入编码与解码函数；I18nProps.languageMap 改为字符串，createI18nStore 接收并解析序列化数据，loadSSRLanguage 改为异步加载并编码语言映射。
借阅页面内联 Markdown 渲染 pages/open-library/how-to-borrow.tsx	模型介绍和借阅流程描述改用 marked.parseInline 生成 dangerouslySetInnerHTML 内容。

Estimated code review effort: 3 (Moderate) | ~20 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题与本次修复 Open Library 借阅页渲染问题的主要变更一致，且简洁明确。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/borrow-page-hydration

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