Add proxy http adapter

lib/core/http_client/dio_http_client.dart

@@ -1,6 +1,8 @@
 import 'dart:convert';
+import 'dart:io';
 
 import 'package:dio/dio.dart';
+import 'package:dio/io.dart';
 import 'package:dio_smart_retry/dio_smart_retry.dart';
 import 'package:flutter_loggy_dio/flutter_loggy_dio.dart';
 import 'package:hiddify/utils/custom_loggers.dart';
@@ -38,6 +40,19 @@ class DioHttpClient with InfraLogger {
 
   late final Dio _dio;
 
+  void setProxyPort(int port) {
+    loggy.debug("setting proxy port: [$port]");
+    _dio.httpClientAdapter = IOHttpClientAdapter(
+      createHttpClient: () {
+        final client = HttpClient();
+        client.findProxy = (url) {
+          return "PROXY localhost:$port; DIRECT";
+        };
+        return client;
+      },
+    );
+  }
+
   Future<Response<T>> get<T>(
     String url, {
     CancelToken? cancelToken,

lib/core/http_client/http_client_provider.dart

@@ -1,15 +1,27 @@
 import 'package:flutter/foundation.dart';
 import 'package:hiddify/core/app_info/app_info_provider.dart';
 import 'package:hiddify/core/http_client/dio_http_client.dart';
+import 'package:hiddify/features/config_option/notifier/config_option_notifier.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 
 part 'http_client_provider.g.dart';
 
 @Riverpod(keepAlive: true)
 DioHttpClient httpClient(HttpClientRef ref) {
-  return DioHttpClient(
+  final client = DioHttpClient(
     timeout: const Duration(seconds: 15),
     userAgent: ref.watch(appInfoProvider).requireValue.userAgent,
     debug: kDebugMode,
   );
+
+  ref.listen(
+    configOptionNotifierProvider,
+    (_, next) {
+      if (next case AsyncData(value: final options)) {
+        client.setProxyPort(options.mixedPort);
+      }
+    },
+    fireImmediately: true,
+  );
+  return client;
 }