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

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+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(),
+      ),
+    );
+  }
+}

lib/app/router.dart

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+import 'package:flutter/foundation.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:go_router/go_router.dart';
+
+import '../core/app_keys.dart';
+import '../features/auth/application/session_controller.dart';
+import '../features/auth/presentation/login_page.dart';
+import '../features/auth/presentation/register_page.dart';
+import '../features/notice/presentation/notice_center_page.dart';
+import '../features/order/presentation/order_detail_page.dart';
+import 'tabs_page.dart';
+
+/// 会话语义变化时驱动 go_router 重新执行 `redirect`。
+class _SessionRefresh extends ChangeNotifier {
+  void bump() => notifyListeners();
+}
+
+/// 路由表，对应源 `pages.json` 的 5 个页面。
+///
+/// 除登录/注册外，其余页面统一使用主题里的 `CupertinoPageTransitionsBuilder`
+/// （新页面从右侧滑入），与源 `PageTransition.vue` 的表现一致。
+final routerProvider = Provider<GoRouter>((ref) {
+  final refresh = _SessionRefresh();
+  ref.listen(sessionProvider, (_, _) => refresh.bump());
+  ref.onDispose(refresh.dispose);
+
+  return GoRouter(
+    navigatorKey: AppKeys.rootNavigator,
+    initialLocation: '/login',
+    refreshListenable: refresh,
+    redirect: (context, state) {
+      final loggedIn = ref.read(sessionProvider).isLoggedIn;
+      final atAuth =
+          state.matchedLocation == '/login' || state.matchedLocation == '/register';
+      if (!loggedIn) return atAuth ? null : '/login';
+      if (atAuth) return '/tabs';
+      return null;
+    },
+    routes: [
+      GoRoute(path: '/login', builder: (context, state) => const LoginPage()),
+      GoRoute(
+        path: '/register',
+        builder: (context, state) => const RegisterPage(),
+      ),
+      GoRoute(path: '/tabs', builder: (context, state) => const TabsPage()),
+
+      // 消息中心：顶栏铃铛入口
+      GoRoute(
+        path: '/notice',
+        builder: (context, state) => const NoticeCenterPage(),
+      ),
+
+      // 订单详情：source 为 repair|install|maintenance|survey
+      GoRoute(
+        path: '/order/:source/:id',
+        builder: (context, state) => OrderDetailPage(
+          source: state.pathParameters['source']!,
+          id: int.parse(state.pathParameters['id']!),
+        ),
+      ),
+    ],
+  );
+});

lib/app/tab_index.dart

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+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+/// 底部导航的三个 Tab，对应 `components/CustomTabBar.vue` 的 3 个入口。
+enum AppTab { order, earnings, profile }
+
+extension AppTabKey on AppTab {
+  /// 与 `XBottomNav.items` 中的 key 一致。
+  String get key => switch (this) {
+    AppTab.order => 'order',
+    AppTab.earnings => 'earnings',
+    AppTab.profile => 'profile',
+  };
+}
+
+/// 当前 Tab。源里每个页面各自挂 `CustomTabBar` 并用 `redirectTo` 切换，
+/// Flutter 端改为单容器 + [IndexedStack]，避免页面重建、保留各自滚动位置。
+class TabIndexController extends Notifier<AppTab> {
+  @override
+  AppTab build() => AppTab.order;
+
+  void select(AppTab tab) => state = tab;
+
+  void selectByKey(String key) {
+    state = AppTab.values.firstWhere((t) => t.key == key, orElse: () => state);
+  }
+}
+
+final tabIndexProvider = NotifierProvider<TabIndexController, AppTab>(
+  TabIndexController.new,
+);

lib/app/tabs_page.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../core/theme/app_colors.dart';
+import '../features/earnings/presentation/earnings_tab.dart';
+import '../features/order/presentation/order_tab.dart';
+import '../features/profile/presentation/profile_tab.dart';
+import '../shared/widgets/x_bottom_nav.dart';
+import 'tab_index.dart';
+
+/// 3 个 Tab 的常驻容器。源项目每个页面各自挂 `CustomTabBar`，
+/// 这里统一收口到容器层，用 [IndexedStack] 保留各页内部状态。
+class TabsPage extends ConsumerWidget {
+  const TabsPage({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final current = ref.watch(tabIndexProvider);
+
+    return Scaffold(
+      backgroundColor: AppColors.bgPage,
+      body: Stack(
+        children: [
+          Positioned.fill(
+            child: IndexedStack(
+              index: current.index,
+              children: const [OrderTab(), EarningsTab(), ProfileTab()],
+            ),
+          ),
+          Positioned(
+            left: 0,
+            right: 0,
+            bottom: 0,
+            child: XBottomNav(
+              current: current.key,
+              onChanged: (key) =>
+                  ref.read(tabIndexProvider.notifier).selectByKey(key),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}