build: 生产环境构建 (ENV=prod) - 新设计系统

- 使用 --dart-define=ENV=prod 参数
- API 指向生产环境: http://8.155.172.147:5010
- 应用新设计系统
- 字体 tree-shaking 优化完成
  * MaterialIcons: 减少 99.4% (1.6MB → 9KB)
  * Lucide 图标: 减少 5-12%
- WebAssembly dry run 成功

flutter_monisuo/build/web/flutter_bootstrap.js

@@ -37,6 +37,6 @@ _flutter.buildConfig = {"engineRevision":"e4b8dca3f1b4ede4c30371002441c88c12187e
 
 _flutter.loader.load({
   serviceWorkerSettings: {
-    serviceWorkerVersion: "3442651337" /* Flutter's service worker is deprecated and will be removed in a future Flutter release. */
+    serviceWorkerVersion: "2149079038" /* Flutter's service worker is deprecated and will be removed in a future Flutter release. */
   }
 });