feat: integrate Google Analytics (G-D42DM82263)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: NanmiCoder

docs/.vitepress/config.mts

@@ -115,9 +115,8 @@ export default defineConfig({
   base: '/',
 
   head: [
-    // Google Analytics - 获取 GA ID 后取消注释
-    // ['script', { async: '', src: 'https://www.googletagmanager.com/gtag/js?id=G-XXXXXXXXXX' }],
-    // ['script', {}, `window.dataLayer = window.dataLayer || [];\nfunction gtag(){dataLayer.push(arguments);}\ngtag('js', new Date());\ngtag('config', 'G-XXXXXXXXXX');`],
+    ['script', { async: '', src: 'https://www.googletagmanager.com/gtag/js?id=G-D42DM82263' }],
+    ['script', {}, `window.dataLayer = window.dataLayer || [];\nfunction gtag(){dataLayer.push(arguments);}\ngtag('js', new Date());\ngtag('config', 'G-D42DM82263');`],
   ],
 
   locales: {