Add android per-app proxy

lib/services/platform_settings.dart

@@ -1,7 +1,13 @@
+import 'dart:convert';
+
 import 'package:flutter/services.dart';
 import 'package:fpdart/fpdart.dart';
+import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:hiddify/utils/utils.dart';
 
+part 'platform_settings.freezed.dart';
+part 'platform_settings.g.dart';
+
 class PlatformSettings with InfraLogger {
   late final MethodChannel _methodChannel =
       const MethodChannel("com.hiddify.app/platform.settings");
@@ -29,4 +35,55 @@ class PlatformSettings with InfraLogger {
       },
     );
   }
+
+  TaskEither<String, List<InstalledPackageInfo>> getInstalledPackages() {
+    return TaskEither(
+      () async {
+        loggy.debug("getting installed packages info");
+        final result =
+            await _methodChannel.invokeMethod<String>("get_installed_packages");
+        if (result == null) return left("null response");
+        return right(
+          (jsonDecode(result) as List).map((e) {
+            return InstalledPackageInfo.fromJson(e as Map<String, dynamic>);
+          }).toList(),
+        );
+      },
+    );
+  }
+
+  TaskEither<String, Uint8List> getPackageIcon(
+    String packageName,
+  ) {
+    return TaskEither(
+      () async {
+        loggy.debug("getting package [$packageName] icon");
+        final result = await _methodChannel.invokeMethod<String>(
+          "get_package_icon",
+          {"packageName": packageName},
+        );
+        if (result == null) return left("null response");
+        final Uint8List decoded;
+        try {
+          decoded = base64.decode(result);
+        } catch (e) {
+          return left("error parsing base64 response");
+        }
+        return right(decoded);
+      },
+    );
+  }
+}
+
+@freezed
+class InstalledPackageInfo with _$InstalledPackageInfo {
+  @JsonSerializable(fieldRename: FieldRename.kebab)
+  const factory InstalledPackageInfo({
+    required String packageName,
+    required String name,
+    required bool isSystemApp,
+  }) = _InstalledPackageInfo;
+
+  factory InstalledPackageInfo.fromJson(Map<String, dynamic> json) =>
+      _$InstalledPackageInfoFromJson(json);
 }