refactor: 将前端从 uni-app x 重构为 Flutter

变更内容:
- 删除 uni-app x 项目 (app/ 目录)
- 新增 Flutter 项目 (flutter_monisuo/ 目录)
- 新增部署脚本 (deploy/ 目录)

Flutter 项目功能:
- 用户登录/注册
- 首页资产概览
- 行情币种列表
- 交易买卖操作
- 资产账户管理
- 充值/提现/划转
- 深色主题
- JWT Token 认证

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

flutter_monisuo/lib/core/network/dio_client.dart

@@ -0,0 +1,155 @@
+import 'package:dio/dio.dart';
+import '../storage/local_storage.dart';
+import 'api_exception.dart';
+
+/// API 响应模型
+class ApiResponse<T> {
+  final bool success;
+  final String? message;
+  final T? data;
+  final String? code;
+
+  ApiResponse({
+    required this.success,
+    this.message,
+    this.data,
+    this.code,
+  });
+
+  factory ApiResponse.success(T data, [String? message]) {
+    return ApiResponse(
+      success: true,
+      data: data,
+      message: message,
+      code: '0000',
+    );
+  }
+
+  factory ApiResponse.fail(String message, [String? code]) {
+    return ApiResponse(
+      success: false,
+      message: message,
+      code: code,
+    );
+  }
+
+  factory ApiResponse.unauthorized(String message) {
+    return ApiResponse(
+      success: false,
+      message: message,
+      code: '0002',
+    );
+  }
+
+  factory ApiResponse.fromJson(
+    Map<String, dynamic> json,
+    T Function(dynamic)? fromJsonT,
+  ) {
+    final code = json['code'] as String? ?? '';
+    final msg = json['msg'] as String? ?? '';
+
+    if (code == '0000') {
+      final data = json['data'];
+      if (fromJsonT != null && data != null) {
+        return ApiResponse.success(fromJsonT(data), msg);
+      }
+      return ApiResponse.success(data as T?, msg);
+    } else if (code == '0002') {
+      return ApiResponse.unauthorized(msg);
+    } else {
+      return ApiResponse.fail(msg, code);
+    }
+  }
+}
+
+/// Dio 网络客户端
+class DioClient {
+  late final Dio _dio;
+
+  DioClient() {
+    _dio = Dio(BaseOptions(
+      baseUrl: 'http://8.155.172.147:5010',
+      connectTimeout: const Duration(seconds: 30),
+      receiveTimeout: const Duration(seconds: 30),
+      headers: {
+        'Content-Type': 'application/json',
+      },
+    ));
+
+    _dio.interceptors.add(_AuthInterceptor());
+    _dio.interceptors.add(LogInterceptor(
+      requestHeader: false,
+      responseHeader: false,
+      error: true,
+    ));
+  }
+
+  /// GET 请求
+  Future<ApiResponse<T>> get<T>(
+    String path, {
+    Map<String, dynamic>? queryParameters,
+    T Function(dynamic)? fromJson,
+  }) async {
+    try {
+      final response = await _dio.get(path, queryParameters: queryParameters);
+      return _handleResponse<T>(response, fromJson);
+    } on DioException catch (e) {
+      return _handleError<T>(e);
+    }
+  }
+
+  /// POST 请求
+  Future<ApiResponse<T>> post<T>(
+    String path, {
+    dynamic data,
+    T Function(dynamic)? fromJson,
+  }) async {
+    try {
+      final response = await _dio.post(path, data: data);
+      return _handleResponse<T>(response, fromJson);
+    } on DioException catch (e) {
+      return _handleError<T>(e);
+    }
+  }
+
+  /// 处理响应
+  ApiResponse<T> _handleResponse<T>(
+    Response response,
+    T Function(dynamic)? fromJson,
+  ) {
+    final data = response.data;
+    if (data is Map<String, dynamic>) {
+      return ApiResponse.fromJson(data, fromJson);
+    }
+    return ApiResponse.fail('响应数据格式错误');
+  }
+
+  /// 处理错误
+  ApiResponse<T> _handleError<T>(DioException e) {
+    if (e.response?.statusCode == 401) {
+      LocalStorage.clearUserData();
+      return ApiResponse.unauthorized('登录已过期，请重新登录');
+    }
+    return ApiResponse.fail(e.message ?? '网络请求失败');
+  }
+}
+
+/// 认证拦截器
+class _AuthInterceptor extends Interceptor {
+  @override
+  void onRequest(RequestOptions options, RequestInterceptorHandler handler) {
+    final token = LocalStorage.getToken();
+    if (token != null && token.isNotEmpty) {
+      options.headers['Authorization'] = 'Bearer $token';
+    }
+    super.onRequest(options, handler);
+  }
+
+  @override
+  void onError(DioException err, ErrorInterceptorHandler handler) {
+    if (err.response?.statusCode == 401) {
+      LocalStorage.clearUserData();
+    }
+    super.onError(err, handler);
+  }
+}