Add Afghanistan region

lib/core/model/region.dart

@@ -4,12 +4,14 @@ enum Region {
   ir,
   cn,
   ru,
+  af,
   other;
 
   String present(TranslationsEn t) => switch (this) {
         ir => t.settings.general.regions.ir,
         cn => t.settings.general.regions.cn,
         ru => t.settings.general.regions.ru,
+        af => t.settings.general.regions.af,
         other => t.settings.general.regions.other,
       };
 }

lib/features/config_option/data/config_option_repository.dart

@@ -65,6 +65,13 @@ class ConfigOptionRepositoryImpl
                 outbound: RuleOutbound.bypass,
               ),
             ],
+          Region.af => [
+              const SingboxRule(
+                domains: "domain:.af,geosite:af",
+                ip: "geoip:af",
+                outbound: RuleOutbound.bypass,
+              ),
+            ],
           _ => <SingboxRule>[],
         };