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/tests/admin.spec.ts

@@ -315,6 +315,10 @@ test('后台可完成媒体库上传/元数据/替换/删除，并执行设置
   await page.getByRole('link', { name: '设置' }).click()
   await page.getByTestId('site-settings-site-name').fill('InitCool Deep Regression')
   await page.getByTestId('site-settings-popup-title').fill('订阅深回归')
+  await page
+    .locator('label', { hasText: '开启文章页微信扫码分享' })
+    .locator('input[type="checkbox"]')
+    .check()
   await page.getByTestId('site-settings-save').click()
   await page.getByTestId('site-settings-reindex').click()
   await page.getByTestId('site-settings-test-provider').click()
@@ -324,6 +328,7 @@ test('后台可完成媒体库上传/元数据/替换/删除，并执行设置
   state = await getDebugState(request)
   expect(state.site_settings.site_name).toBe('InitCool Deep Regression')
   expect(state.site_settings.subscription_popup_title).toBe('订阅深回归')
+  expect(state.site_settings.seo_wechat_share_qr_enabled).toBe(true)
   expect(state.site_settings.ai_chunks_count).toBeGreaterThan(128)
 })