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/helpers.ts

@@ -19,6 +19,20 @@ export async function getDebugState(request: APIRequestContext) {
   return response.json()
 }
 
+export async function patchAdminSiteSettings(
+  request: APIRequestContext,
+  payload: Record<string, unknown>,
+) {
+  const response = await request.patch(`${MOCK_BASE_URL}/api/admin/site-settings`, {
+    headers: {
+      cookie: `${ADMIN_COOKIE.name}=${ADMIN_COOKIE.value}`,
+    },
+    data: payload,
+  })
+  expect(response.ok()).toBeTruthy()
+  return response.json()
+}
+
 export async function loginAdmin(page: Page) {
   await page.goto('/login')
   await page.getByLabel('用户名').fill('admin')