feat(app): 初始化家庭网络监控Flutter应用基本结构

- 添加Flutter项目基础文件与配置，包括.gitignore和analysis_options.yaml
- 配置Android相关文件及Gradle构建脚本支持
- 新增设备状态与网络状态数据模型及相关枚举
- 实现网络检测及网速测试服务
- 创建监控状态管理Provider，实现设备状态管理和自动刷新机制
- 编写主界面HomeScreen，包括设备列表、网速仪表盘及基础交互
- 添加资源文件支持应用图标和启动画面
- 配置项目元数据文件，支持Flutter迁移及版本控制
- 新增项目README，提供入门指引和相关资源链接

home_monitor/lib/services/network_service.dart

@@ -0,0 +1,119 @@
+import 'dart:async';
+import 'dart:io';
+import '../models/models.dart';
+
+/// 网络检测服务
+class NetworkService {
+  static final NetworkService _instance = NetworkService._internal();
+  factory NetworkService() => _instance;
+  NetworkService._internal();
+
+  /// Ping指定主机
+  Future<int?> ping(String host, {int timeout = 5000}) async {
+    try {
+      final stopwatch = Stopwatch()..start();
+      
+      // 尝试建立TCP连接来检测
+      final socket = await Socket.connect(
+        host,
+        80,
+        timeout: Duration(milliseconds: timeout),
+      );
+      
+      stopwatch.stop();
+      socket.destroy();
+      
+      return stopwatch.elapsedMilliseconds;
+    } catch (e) {
+      return null;
+    }
+  }
+
+  /// 检测设备是否在线
+  Future<DeviceStatus> checkDevice(DeviceStatus device) async {
+    final stopwatch = Stopwatch()..start();
+    
+    try {
+      final socket = await Socket.connect(
+        device.ip,
+        device.port,
+        timeout: const Duration(seconds: 5),
+      );
+      
+      stopwatch.stop();
+      socket.destroy();
+      
+      return device.copyWith(
+        state: DeviceState.online,
+        latency: stopwatch.elapsedMilliseconds,
+        lastCheck: DateTime.now(),
+        errorMessage: null,
+      );
+    } on SocketException catch (e) {
+      return device.copyWith(
+        state: DeviceState.offline,
+        latency: null,
+        lastCheck: DateTime.now(),
+        errorMessage: e.message,
+      );
+    } catch (e) {
+      return device.copyWith(
+        state: DeviceState.unknown,
+        latency: null,
+        lastCheck: DateTime.now(),
+        errorMessage: e.toString(),
+      );
+    }
+  }
+
+  /// 批量检测设备
+  Future<List<DeviceStatus>> checkAllDevices(List<DeviceStatus> devices) async {
+    final results = await Future.wait(
+      devices.map((device) => checkDevice(device)),
+    );
+    return results;
+  }
+
+  /// 检测网络连通性（通过多个公共DNS）
+  Future<bool> checkInternetConnection() async {
+    final hosts = [
+      '8.8.8.8',        // Google DNS
+      '114.114.114.114', // 114 DNS
+      '223.5.5.5',      // 阿里 DNS
+    ];
+
+    for (final host in hosts) {
+      final latency = await ping(host);
+      if (latency != null) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  /// 获取本地IP地址
+  Future<String> getLocalIp() async {
+    try {
+      final interfaces = await NetworkInterface.list(
+        type: InternetAddressType.IPv4,
+      );
+      
+      for (final interface in interfaces) {
+        for (final addr in interface.addresses) {
+          if (!addr.isLoopback) {
+            return addr.address;
+          }
+        }
+      }
+    } catch (e) {
+      // 忽略错误
+    }
+    return '未知';
+  }
+
+  /// 测量到指定主机的延迟
+  Future<int> measureLatency(String host) async {
+    final latency = await ping(host);
+    return latency ?? -1;
+  }
+}