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/data/services/trade_service.dart

@@ -0,0 +1,78 @@
+import '../../core/constants/api_endpoints.dart';
+import '../../core/network/dio_client.dart';
+import '../models/order_models.dart';
+
+/// 交易服务
+class TradeService {
+  final DioClient _client;
+
+  TradeService(this._client);
+
+  /// 买入
+  Future<ApiResponse<Map<String, dynamic>>> buy({
+    required String coinCode,
+    required String price,
+    required String quantity,
+  }) async {
+    return _client.post<Map<String, dynamic>>(
+      ApiEndpoints.buy,
+      data: {
+        'coinCode': coinCode,
+        'price': price,
+        'quantity': quantity,
+      },
+    );
+  }
+
+  /// 卖出
+  Future<ApiResponse<Map<String, dynamic>>> sell({
+    required String coinCode,
+    required String price,
+    required String quantity,
+  }) async {
+    return _client.post<Map<String, dynamic>>(
+      ApiEndpoints.sell,
+      data: {
+        'coinCode': coinCode,
+        'price': price,
+        'quantity': quantity,
+      },
+    );
+  }
+
+  /// 获取交易记录
+  Future<ApiResponse<Map<String, dynamic>>> getOrders({
+    String? coinCode,
+    int? direction,
+    int pageNum = 1,
+    int pageSize = 20,
+  }) async {
+    final params = <String, dynamic>{
+      'pageNum': pageNum,
+      'pageSize': pageSize,
+    };
+    if (coinCode != null) params['coinCode'] = coinCode;
+    if (direction != null) params['direction'] = direction;
+
+    return _client.get<Map<String, dynamic>>(
+      ApiEndpoints.tradeOrders,
+      queryParameters: params,
+    );
+  }
+
+  /// 获取订单详情
+  Future<ApiResponse<OrderTrade>> getOrderDetail(String orderNo) async {
+    final response = await _client.get<Map<String, dynamic>>(
+      ApiEndpoints.tradeOrderDetail,
+      queryParameters: {'orderNo': orderNo},
+    );
+
+    if (response.success && response.data != null) {
+      return ApiResponse.success(
+        OrderTrade.fromJson(response.data!),
+        response.message,
+      );
+    }
+    return ApiResponse.fail(response.message ?? '获取订单详情失败');
+  }
+}