Add core mode

lib/domain/singbox/config_options.dart

@@ -4,7 +4,6 @@ import 'package:freezed_annotation/freezed_annotation.dart';
 import 'package:hiddify/core/prefs/prefs.dart';
 import 'package:hiddify/domain/singbox/box_log.dart';
 import 'package:hiddify/domain/singbox/rules.dart';
-import 'package:hiddify/utils/platform_utils.dart';
 
 part 'config_options.freezed.dart';
 part 'config_options.g.dart';
@@ -34,16 +33,13 @@ class ConfigOptions with _$ConfigOptions {
     @Default(true) bool enableClashApi,
     @Default(6756) int clashApiPort,
     @Default(false) bool enableTun,
-    @Default(true) bool setSystemProxy,
+    @Default(false) bool setSystemProxy,
     @Default(false) bool bypassLan,
     @Default(false) bool enableFakeDns,
     List<Rule>? rules,
   }) = _ConfigOptions;
 
-  static ConfigOptions initial = ConfigOptions(
-    enableTun: !PlatformUtils.isDesktop,
-    setSystemProxy: PlatformUtils.isDesktop,
-  );
+  static ConfigOptions initial = const ConfigOptions();
 
   String format() {
     const encoder = JsonEncoder.withIndent('  ');

lib/domain/singbox/core_mode.dart

@@ -0,0 +1,13 @@
+import 'package:hiddify/core/prefs/locale_prefs.dart';
+
+enum CoreMode {
+  none,
+  proxy,
+  tun;
+
+  String present(TranslationsEn t) => switch (this) {
+        none => t.settings.config.modes.none,
+        proxy => t.settings.config.modes.proxy,
+        tun => t.settings.config.modes.tun,
+      };
+}

lib/domain/singbox/singbox.dart

@@ -1,5 +1,6 @@
 export 'box_log.dart';
 export 'config_options.dart';
+export 'core_mode.dart';
 export 'core_status.dart';
 export 'outbounds.dart';
 export 'proxy_type.dart';