feat: add SharePanel component for social sharing with QR code support

- Implemented SharePanel component in `SharePanel.astro` for sharing content on social media platforms.
- Integrated QR code generation for WeChat sharing using the `qrcode` library.
- Added localization support for English and Chinese languages.
- Created utility functions in `seo.ts` for building article summaries and FAQs.
- Introduced API routes for serving IndexNow key and generating full LLM catalog and summaries.
- Enhanced SEO capabilities with structured data for articles and pages.

playwright-smoke/README.md

@@ -29,5 +29,6 @@ pnpm test:ui
 - 本地默认优先走已安装的 `msedge` channel，CI 仍使用 `playwright install chromium`。
 - 当前已覆盖：
   - 前台：首页过滤、文章详情、评论、搜索、AI 问答、友链申请、订阅确认/管理/退订
+  - 前台 GEO 能力：llms.txt / llms-full.txt 入口、分享面板、微信扫码分享、AI 摘要块
   - 后台：登录、导航、评论审核、友链审核
-  - 后台深度回归：分类 CRUD、标签 CRUD、订阅 CRUD / 测试发送 / weekly & monthly digest、文章创建/保存/版本恢复/删除、媒体上传/元数据/替换/删除、站点设置保存/AI 重建索引/Provider 连通性/存储连通性、评测 CRUD / AI 润色、评论画像与黑名单管理
+  - 后台深度回归：分类 CRUD、标签 CRUD、订阅 CRUD / 测试发送 / weekly & monthly digest、文章创建/保存/版本恢复/删除、媒体上传/元数据/替换/删除、站点设置保存 / 微信扫码分享开关 / AI 重建索引 / Provider 连通性 / 存储连通性、评测 CRUD / AI 润色、评论画像与黑名单管理