Add site icons for favicon and home screen shortcuts

Include favicon, apple-touch-icon, web manifest, and navbar logo for bookmarks and PWA-style shortcuts.

Co-authored-by: Cursor <cursoragent@cursor.com>

.vitepress/config.mts

@@ -25,7 +25,17 @@ export default defineConfig({
   ],
   cleanUrls: true,
   ignoreDeadLinks: true,
+  head: [
+    ['link', { rel: 'icon', href: '/favicon.svg', type: 'image/svg+xml' }],
+    ['link', { rel: 'icon', href: '/favicon.png', type: 'image/png', sizes: '512x512' }],
+    ['link', { rel: 'apple-touch-icon', href: '/apple-touch-icon.png', sizes: '180x180' }],
+    ['link', { rel: 'manifest', href: '/site.webmanifest' }],
+    ['meta', { name: 'theme-color', content: '#0f3460' }],
+    ['meta', { name: 'apple-mobile-web-app-title', content: '道德经' }],
+    ['meta', { name: 'application-name', content: 'DAO DE JING' }],
+  ],
   themeConfig: {
+    logo: { src: '/favicon.png', width: 24, height: 24 },
     nav: [
       { text: '首页', link: '/' },
       { text: '五行', link: '/金、木、水、火、土 - 五行/' },