feat: implement self-signed certificate support in API and UI

- Added support for self-signed TLS certificates in the ApiService, allowing configuration based on server settings.
- Introduced a toggle in the ServerConnectionPage to enable or disable trusting self-signed certificates.
- Updated localization files to include new strings for self-signed certificate settings in multiple languages.
- Enhanced the OptimizedStorageService to manage trusted servers based on user preferences for self-signed certificates.
- Improved error handling and logging throughout the affected services to ensure clarity and maintainability.

lib/l10n/app_localizations_fr.dart

@@ -765,6 +765,14 @@ class AppLocalizationsFr extends AppLocalizations {
   String get customHeadersDescription =>
       'Ajoutez des en-têtes HTTP personnalisés pour l\'authentification, les clés API ou des exigences spécifiques du serveur.';
 
+  @override
+  String get allowSelfSignedCertificates =>
+      'Faire confiance aux certificats auto-signés';
+
+  @override
+  String get allowSelfSignedCertificatesDescription =>
+      'Acceptez le certificat TLS de ce serveur même s\'il est auto-signé. Activez cette option uniquement pour les serveurs auxquels vous faites confiance.';
+
   @override
   String get headerNameEmpty => 'Le nom de l\'en-tête ne peut pas être vide';