feat: conditionally inject Cloudflare Analytics script

- Updated index.html to include a placeholder for Cloudflare Web Analytics, which is now only injected in production mode.
- Modified vite.config.ts to implement an HTML transform plugin that dynamically adds the Cloudflare script based on the environment.

index.html

@@ -65,8 +65,8 @@
     <div id="root"></div>
     <script type="module" src="/src/main.tsx"></script>
 
-    <!-- Cloudflare Web Analytics -->
-    <script defer src='https://static.cloudflareinsights.com/beacon.min.js' data-cf-beacon='{"token": "2aecdc025eb043bc89ce931b54a80054"}'></script>
+    <!-- Cloudflare Web Analytics - Only in Production -->
+    <!--CLOUDFLARE_ANALYTICS_PLACEHOLDER-->
     <!-- End Cloudflare Web Analytics -->
   </body>
 </html>

vite.config.ts

@@ -5,10 +5,20 @@ import tailwindcss from "@tailwindcss/vite"
 import { VitePWA } from 'vite-plugin-pwa'
 
 // https://vite.dev/config/
-export default defineConfig({
+export default defineConfig(({ mode }) => ({
   plugins: [
     react(), 
     tailwindcss(),
+    // HTML 替换插件 - 仅在生产环境注入 Cloudflare Analytics
+    {
+      name: 'html-transform',
+      transformIndexHtml(html) {
+        const cloudflareScript = mode === 'production' 
+          ? `<script defer src='https://static.cloudflareinsights.com/beacon.min.js' data-cf-beacon='{"token": "2aecdc025eb043bc89ce931b54a80054"}'></script>`
+          : '';
+        return html.replace('<!--CLOUDFLARE_ANALYTICS_PLACEHOLDER-->', cloudflareScript);
+      }
+    },
     VitePWA({
       registerType: 'autoUpdate',
       includeAssets: ['lite.svg', 'robots.txt', 'sitemap.xml'],
@@ -130,4 +140,4 @@ export default defineConfig({
     },
     chunkSizeWarningLimit: 500,
   },
-})
+}))