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/router.dart

@@ -0,0 +1,63 @@
+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']!),
+        ),
+      ),
+    ],
+  );
+});