Added plain dns control

lib/l10n/app_en.arb

@@ -772,5 +772,7 @@
     "customRulesNotUpdated": "Custom rules could not be updated",
     "reorder": "Reorder",
     "showHide": "Show/hide",
-    "noElementsReorderMessage": "Enable some elements on the show/hide tab to reorder them here."
+    "noElementsReorderMessage": "Enable some elements on the show/hide tab to reorder them here.",
+    "enablePlainDns": "Enable plain DNS",
+    "enablePlainDnsDescription": "Plain DNS is enabled by default. You can disable it to force all devices to use encrypted DNS. To do this, you must enable at least one encrypted DNS protocol."
 }

lib/l10n/app_es.arb

@@ -772,5 +772,7 @@
     "customRulesNotUpdated": "Las reglas personalizadas no pudieron ser actualizadas",
     "reorder": "Reordenar",
     "showHide": "Mostrar/ocultar",
-    "noElementsReorderMessage": "Activa algunos elementos en la pestaña de mostrar/ocultar para reordenarlos aquí."
+    "noElementsReorderMessage": "Activa algunos elementos en la pestaña de mostrar/ocultar para reordenarlos aquí.",
+    "enablePlainDns": "Activar DNS simple (sin cifrado)",
+    "enablePlainDnsDescription": "El DNS simple (sin cifrado) está activado de forma predeterminada. Puedes desactivarlo para obligar a todos los dispositivos a utilizar DNS cifrado. Para ello, debes habilitar al menos un protocolo DNS cifrado."
 }

lib/models/encryption.dart

@@ -39,6 +39,7 @@ class EncryptionData {
   final String certificatePath;
   final String privateKeyPath;
   final bool privateKeySaved;
+  final bool? servePlainDns;
 
   EncryptionData({
     required this.validCert,
@@ -65,6 +66,7 @@ class EncryptionData {
     required this.certificatePath,
     required this.privateKeyPath,
     required this.privateKeySaved,
+    required this.servePlainDns,
   });
 
 
@@ -93,6 +95,7 @@ class EncryptionData {
     certificatePath: json["certificate_path"],
     privateKeyPath: json["private_key_path"],
     privateKeySaved: json["private_key_saved"],
+    servePlainDns: json["serve_plain_dns"],
   );
 
   Map<String, dynamic> toJson() => {
@@ -120,6 +123,7 @@ class EncryptionData {
     "certificate_path": certificatePath,
     "private_key_path": privateKeyPath,
     "private_key_saved": privateKeySaved,
+    "serve_plain_dns": servePlainDns,
   };
 }
 

lib/screens/settings/encryption/encryption.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 
+import 'package:adguard_home_manager/widgets/custom_checkbox_list_tile.dart';
 import 'package:adguard_home_manager/widgets/section_label.dart';
 import 'package:adguard_home_manager/widgets/custom_switch_list_tile.dart';
 import 'package:adguard_home_manager/screens/settings/encryption/status.dart';
@@ -35,6 +36,8 @@ class _EncryptionSettingsState extends State<EncryptionSettings> {
 
   bool enabled = false;
 
+  bool? _plainDns;
+
   final TextEditingController domainNameController = TextEditingController();
   String? domainError;
 
@@ -112,6 +115,7 @@ class _EncryptionSettingsState extends State<EncryptionSettings> {
           privateKeyPathController.text = data.privateKeyPath;
         }
         usePreviouslySavedKey = data.privateKeySaved;
+        _plainDns = data.servePlainDns;
         loadStatus = LoadStatus.loaded;
       });
     }
@@ -224,6 +228,7 @@ class _EncryptionSettingsState extends State<EncryptionSettings> {
           "private_key_saved": usePreviouslySavedKey,
           "certificate_path": certificatePathController.text,
           "private_key_path": privateKeyPathController.text,
+          "serve_plain_dns": _plainDns
         }
       );
 
@@ -271,6 +276,7 @@ class _EncryptionSettingsState extends State<EncryptionSettings> {
           "private_key_saved": false,
           "certificate_path": "",
           "private_key_path": "",
+          "serve_plain_dns": true
         }
       );
       if (!mounted) return;
@@ -372,6 +378,15 @@ class _EncryptionSettingsState extends State<EncryptionSettings> {
                         onEditValidate();
                       }
                     ),
+                    if (_plainDns != null) ...[
+                      const SizedBox(height: 8),
+                      CustomCheckboxListTile(
+                        value: _plainDns!, 
+                        onChanged: (v) => setState(() => _plainDns = v), 
+                        title: AppLocalizations.of(context)!.enablePlainDns,
+                        subtitle: AppLocalizations.of(context)!.enablePlainDnsDescription,
+                      ),
+                    ],
                     SectionLabel(
                       label: AppLocalizations.of(context)!.serverConfiguration,
                       padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 24),