Add config options

lib/core/prefs/general_prefs.dart

@@ -1,3 +1,5 @@
 import 'package:hiddify/utils/pref_notifier.dart';
 
 final silentStartProvider = PrefNotifier.provider("silent_start", false);
+
+final debugModeProvider = PrefNotifier.provider("debug_mode", false);

lib/core/prefs/misc_prefs.dart

@@ -1,12 +0,0 @@
-import 'package:hiddify/domain/constants.dart';
-import 'package:hiddify/utils/pref_notifier.dart';
-
-final connectionTestUrlProvider =
-    PrefNotifier.provider("connection_test_url", Defaults.connectionTestUrl);
-
-final concurrentTestCountProvider = PrefNotifier.provider(
-  "concurrent_test_count",
-  Defaults.concurrentTestCount,
-);
-
-final debugModeProvider = PrefNotifier.provider("debug_mode", false);

lib/core/prefs/prefs.dart

@@ -1,2 +1 @@
 export 'general_prefs.dart';
-export 'misc_prefs.dart';