feat: 完成智能电网电工端 Flutter 应用初始化

创建完整的 Flutter 项目结构，包含 Android 和 iOS 平台配置、核心网络层、路由、状态管理及业务模块（订单、收益、认证），适配原 uni-app 项目功能逻辑

lib/app/app.dart

@@ -0,0 +1,37 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../core/app_keys.dart';
+import '../core/theme/app_theme.dart';
+import '../core/theme/app_typography.dart';
+import 'router.dart';
+
+class VoltLinkApp extends ConsumerWidget {
+  const VoltLinkApp({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final router = ref.watch(routerProvider);
+
+    return MaterialApp.router(
+      title: 'VoltLink',
+      debugShowCheckedModeBanner: false,
+      theme: AppTheme.build(),
+      routerConfig: router,
+      scaffoldMessengerKey: AppKeys.scaffoldMessenger,
+      locale: const Locale('zh', 'CN'),
+      supportedLocales: const [Locale('zh', 'CN'), Locale('en', 'US')],
+      localizationsDelegates: const [
+        GlobalMaterialLocalizations.delegate,
+        GlobalWidgetsLocalizations.delegate,
+        GlobalCupertinoLocalizations.delegate,
+      ],
+      // 对应源 `page` 上的全局字体设置。
+      builder: (context, child) => DefaultTextStyle(
+        style: appDefaultTextStyle,
+        child: child ?? const SizedBox.shrink(),
+      ),
+    );
+  }
+}