fix: generalize site footer content

[dethan3]

Summary

• parameterize the shared Footer component instead of duplicating it
• select global or Open Library content from _app.tsx based on the current route
• preserve the current Open Library footer content and responsive layout
• restore global-site copyright history and Vercel attribution
• add Simplified Chinese, Traditional Chinese, and English global footer copy
• use Next.js client-side links for footer quick links

Context

This follows the reviewer feedback in #116: keep one Footer component and pass route-specific content into it instead of maintaining two independent footer implementations.

Validation

• pnpm test passed
• Prettier and git diff --check passed
• TypeScript and webpack production compilation passed via CI=true NEXT_TELEMETRY_DISABLED=1 pnpm exec next build --webpack
• full static generation exits during the existing page-data generation phase in the current local environment
• verified /, /article/about, /open-library, and /open-library/books in a local browser
• visually checked global and Open Library footers at desktop and mobile widths

Close #115

[coderabbitai]

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[dethan3]

Responsive design follow-up:

• desktop Footer now uses three equal-width columns with left / center / right content alignment
• mobile Footer now has distinct brand, quick-link, contact, and copyright regions
• quick-link touch targets are 44px high and icon/text columns align consistently
• tablet layout uses a full-width brand row plus two balanced secondary columns
• Open Library keeps its existing copy and links while sharing the responsive structure

Validation completed at 375px, 768px, and 1440px with no horizontal overflow. pnpm test, TypeScript, Prettier, diff checks, and webpack compilation pass.

[dethan3]

已按项目样式约定继续优化：删除 Footer.module.less（92 行），改由 Bootstrap 5.3 栅格和工具类承担布局、间距、分隔、对齐及响应式展示。已验证 375/768/1440px：无横向溢出；平板两列等分；桌面三列宽度均为 437.33px；开源图书馆仍保留 Catalog / How to Borrow 和原描述。pnpm test 与 CodeQL 均通过。Build-and-Deploy 仍因 Vercel Team fair-use 限额失败。提交：31786fa。

[TechQuery]

所有问题都要通篇改。

[TechQuery]

所有问题通篇要改