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/main.dart

@@ -11,6 +11,7 @@ import 'core/providers/app_providers.dart';
 import 'core/persistence/hive_bootstrap.dart';
 import 'core/persistence/persistence_migrator.dart';
 import 'core/persistence/persistence_providers.dart';
+import 'core/services/self_signed_certificate_manager.dart';
 import 'core/router/app_router.dart';
 import 'shared/widgets/offline_indicator.dart';
 import 'features/auth/providers/unified_auth_providers.dart';
@@ -29,6 +30,8 @@ void main() {
     () async {
       WidgetsFlutterBinding.ensureInitialized();
 
+      SelfSignedCertificateManager.instance.ensureInitialized();
+
       // Global error handlers
       FlutterError.onError = (FlutterErrorDetails details) {
         DebugLogger.error(