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.

package.json

@@ -13,6 +13,7 @@
     "test:ui:admin": "pnpm --dir ./playwright-smoke test:admin",
     "test:ui:headed": "pnpm --dir ./playwright-smoke test:headed",
     "test:ui:install-browsers": "pnpm --dir ./playwright-smoke install:browsers",
+    "indexnow:submit": "pnpm --dir ./frontend run indexnow:submit",
     "stop": "powershell -ExecutionPolicy Bypass -File ./stop-services.ps1",
     "restart": "powershell -ExecutionPolicy Bypass -File ./restart-services.ps1"
   }