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/core/network/api_response.dart

@@ -0,0 +1,39 @@
+/// 统一 API 响应模型
+class ApiResponse<T> {
+  final int code;
+  final String message;
+  final T? data;
+
+  ApiResponse({
+    required this.code,
+    required this.message,
+    this.data,
+  });
+
+  bool get isSuccess => code == 200 || code == 0;
+
+  factory ApiResponse.fromJson(Map<String, dynamic> json, T Function(dynamic)? fromJsonT) {
+    return ApiResponse(
+      code: json['code'] ?? 0,
+      message: json['message'] ?? '',
+      data: json['data'] != null && fromJsonT != null ? fromJsonT(json['data']) : json['data'] as T?,
+    );
+  }
+}
+
+/// 分页响应模型
+class PaginatedResponse<T> {
+  final List<T> list;
+  final int total;
+  final int page;
+  final int pageSize;
+
+  PaginatedResponse({
+    required this.list,
+    required this.total,
+    required this.page,
+    required this.pageSize,
+  });
+
+  bool get hasMore => page * pageSize < total;
+}

mobile-app/lib/core/network/auth_interceptor.dart

@@ -0,0 +1,41 @@
+import 'package:dio/dio.dart';
+import '../../features/auth/services/token_service.dart';
+import '../constants/app_constants.dart';
+
+/// Token 认证拦截器
+/// 自动在请求头中附加 Token，处理 Token 刷新
+class AuthInterceptor extends Interceptor {
+  final TokenService _tokenService = TokenService();
+
+  @override
+  void onRequest(RequestOptions options, RequestInterceptorHandler handler) async {
+    final token = await _tokenService.getToken();
+    if (token != null) {
+      options.headers['Authorization'] = 'Bearer $token';
+    }
+    handler.next(options);
+  }
+
+  @override
+  void onError(DioException err, ErrorInterceptorHandler handler) async {
+    if (err.response?.statusCode == 401) {
+      // Token 过期，尝试刷新
+      try {
+        final refreshed = await _tokenService.refreshToken();
+        if (refreshed) {
+          // 使用新 Token 重试请求
+          final token = await _tokenService.getToken();
+          err.requestOptions.headers['Authorization'] = 'Bearer $token';
+          
+          final response = await Dio().fetch(err.requestOptions);
+          handler.resolve(response);
+          return;
+        }
+      } catch (_) {
+        // 刷新失败，清除 Token 并跳转登录
+        await _tokenService.clearTokens();
+      }
+    }
+    handler.next(err);
+  }
+}

mobile-app/lib/core/network/dio_client.dart

@@ -0,0 +1,79 @@
+import 'package:dio/dio.dart';
+import '../constants/app_constants.dart';
+import 'auth_interceptor.dart';
+
+/// Dio HTTP 客户端配置
+class DioClient {
+  static DioClient? _instance;
+  late Dio _dio;
+
+  Dio get dio => _dio;
+
+  DioClient._internal() {
+    _dio = Dio(
+      BaseOptions(
+        baseUrl: AppConstants.baseUrl + AppConstants.apiVersion,
+        connectTimeout: const Duration(milliseconds: AppConstants.connectTimeout),
+        receiveTimeout: const Duration(milliseconds: AppConstants.receiveTimeout),
+        headers: {
+          'Content-Type': 'application/json',
+          'Accept': 'application/json',
+        },
+      ),
+    );
+
+    // 添加拦截器
+    _dio.interceptors.addAll([
+      AuthInterceptor(),
+      LogInterceptor(
+        requestBody: true,
+        responseBody: true,
+        logPrint: (obj) => print('[DioLog] $obj'),
+      ),
+    ]);
+  }
+
+  factory DioClient() {
+    _instance ??= DioClient._internal();
+    return _instance!;
+  }
+
+  /// GET 请求
+  Future<Response<T>> get<T>(
+    String path, {
+    Map<String, dynamic>? queryParameters,
+    Options? options,
+  }) async {
+    return _dio.get<T>(path, queryParameters: queryParameters, options: options);
+  }
+
+  /// POST 请求
+  Future<Response<T>> post<T>(
+    String path, {
+    dynamic data,
+    Map<String, dynamic>? queryParameters,
+    Options? options,
+  }) async {
+    return _dio.post<T>(path, data: data, queryParameters: queryParameters, options: options);
+  }
+
+  /// PUT 请求
+  Future<Response<T>> put<T>(
+    String path, {
+    dynamic data,
+    Map<String, dynamic>? queryParameters,
+    Options? options,
+  }) async {
+    return _dio.put<T>(path, data: data, queryParameters: queryParameters, options: options);
+  }
+
+  /// DELETE 请求
+  Future<Response<T>> delete<T>(
+    String path, {
+    dynamic data,
+    Map<String, dynamic>? queryParameters,
+    Options? options,
+  }) async {
+    return _dio.delete<T>(path, data: data, queryParameters: queryParameters, options: options);
+  }
+}