feat(mobile): #24 Flutter三合一APP骨架搭建

- Flutter 3.x 项目初始化（pubspec.yaml + 目录结构）
- 核心依赖：dio/go_router/provider/shared_preferences/hive/geolocator
- 统一登录页 + Token管理（TokenService + AuthInterceptor）
- 底部Tab三合一导航（供水/巡检/营收）
- 供水管理Tab：监测数据列表（MonitorListPage）
- 巡检Tab：任务列表+状态筛选+进度展示（PatrolTaskListPage）
- 营收Tab：抄表页面+账单列表（MeterReadingPage/BillListPage）
- 消息推送服务（PushService）
- GPS定位服务（LocationService）
- 拍照/相册服务（CameraService）
- 离线缓存服务（CacheService）
- Android/iOS打包配置+权限声明
- GoRouter路由+Auth认证守卫
- Provider状态管理

mobile-app/lib/config/app_config.dart

@@ -0,0 +1,39 @@
+/// 应用全局配置
+class AppConfig {
+  static AppConfig? _instance;
+
+  AppConfig._internal();
+
+  factory AppConfig() {
+    _instance ??= AppConfig._internal();
+    return _instance!;
+  }
+
+  /// 环境配置
+  AppEnvironment _environment = AppEnvironment.development;
+  AppEnvironment get environment => _environment;
+
+  /// 切换环境
+  void setEnvironment(AppEnvironment env) {
+    _environment = env;
+  }
+
+  /// API 基础地址
+  String get baseUrl {
+    switch (_environment) {
+      case AppEnvironment.development:
+        return 'https://dev-api.xayunmei.com';
+      case AppEnvironment.staging:
+        return 'https://staging-api.xayunmei.com';
+      case AppEnvironment.production:
+        return 'https://api.xayunmei.com';
+    }
+  }
+}
+
+/// 环境枚举
+enum AppEnvironment {
+  development,
+  staging,
+  production,
+}

mobile-app/lib/config/app_routes.dart

@@ -0,0 +1,42 @@
+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+import '../features/auth/pages/login_page.dart';
+import '../features/auth/services/token_service.dart';
+import '../features/main_shell/pages/main_shell_page.dart';
+import '../features/revenue/pages/bill_list_page.dart';
+
+/// 应用路由配置
+class AppRoutes {
+  static const String login = '/login';
+  static const String main = '/main';
+  static const String bills = '/bills';
+
+  static GoRouter createRouter() {
+    return GoRouter(
+      initialLocation: login,
+      redirect: (BuildContext context, GoRouterState state) async {
+        final tokenService = TokenService();
+        final isLoggedIn = await tokenService.isLoggedIn();
+        final isGoingToLogin = state.matchedLocation == login;
+
+        if (!isLoggedIn && !isGoingToLogin) return login;
+        if (isLoggedIn && isGoingToLogin) return main;
+        return null;
+      },
+      routes: [
+        GoRoute(
+          path: login,
+          builder: (context, state) => const LoginPage(),
+        ),
+        GoRoute(
+          path: main,
+          builder: (context, state) => const MainShellPage(),
+        ),
+        GoRoute(
+          path: bills,
+          builder: (context, state) => const BillListPage(),
+        ),
+      ],
+    );
+  }
+}