feat: enhance tool loading and performance optimization

- Added DNS prefetch and preconnect links in index.html for improved API loading times.
- Implemented lazy loading for tool components to optimize performance and reduce initial load time.
- Wrapped tool components in Suspense with a loading fallback to enhance user experience during loading.
- Refactored Vite configuration to create manual chunks for better code splitting of React and UI libraries.

vite.config.ts

@@ -11,4 +11,27 @@ export default defineConfig({
       "@": path.resolve(__dirname, "./src"),
     },
   },
+  build: {
+    rollupOptions: {
+      output: {
+        manualChunks: (id) => {
+          // React核心库
+          if (id.includes('node_modules/react') || 
+              id.includes('node_modules/react-dom') || 
+              id.includes('node_modules/react-router-dom')) {
+            return 'react-vendor';
+          }
+          // Radix UI组件
+          if (id.includes('node_modules/@radix-ui')) {
+            return 'ui-vendor';
+          }
+          // 图标库
+          if (id.includes('node_modules/lucide-react')) {
+            return 'icons';
+          }
+        },
+      },
+    },
+    chunkSizeWarningLimit: 500,
+  },
 })