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/mock-server.mjs

@@ -824,6 +824,7 @@ function createSiteSettings() {
     media_r2_secret_access_key: 'mock-secret',
     seo_default_og_image: `${MOCK_ORIGIN}/media-files/default-og.svg`,
     seo_default_twitter_handle: '@initcool',
+    seo_wechat_share_qr_enabled: false,
     notification_webhook_url: 'https://notify.mock.invalid/termi',
     notification_channel_type: 'webhook',
     notification_comment_enabled: true,
@@ -2528,8 +2529,19 @@ const server = createServer(async (req, res) => {
         recent_events: [],
         providers_last_7d: [{ provider: 'mock-openai', count: 18 }],
         top_referrers: [{ referrer: 'homepage', count: 44 }],
+        ai_referrers_last_7d: [
+          { referrer: 'chatgpt-search', count: 21 },
+          { referrer: 'perplexity', count: 9 },
+          { referrer: 'copilot-bing', count: 6 },
+        ],
+        ai_discovery_page_views_last_7d: 36,
         popular_posts: getHomePayload().popular_posts,
-        daily_activity: [{ date: '2026-04-01', searches: 9, ai_questions: 5 }],
+        daily_activity: [
+          { date: '2026-03-29', searches: 6, ai_questions: 3 },
+          { date: '2026-03-30', searches: 7, ai_questions: 4 },
+          { date: '2026-03-31', searches: 11, ai_questions: 6 },
+          { date: '2026-04-01', searches: 9, ai_questions: 5 },
+        ],
       })
       return
     }
@@ -2707,6 +2719,7 @@ const server = createServer(async (req, res) => {
         mediaR2SecretAccessKey: 'media_r2_secret_access_key',
         seoDefaultOgImage: 'seo_default_og_image',
         seoDefaultTwitterHandle: 'seo_default_twitter_handle',
+        seoWechatShareQrEnabled: 'seo_wechat_share_qr_enabled',
         notificationWebhookUrl: 'notification_webhook_url',
         notificationChannelType: 'notification_channel_type',
         notificationCommentEnabled: 'notification_comment_enabled',