feat: Add User-Agent header to Allegro API requests

- Implemented buildUserAgent() method in AllegroApiClient, AllegroOAuthClient, and AllegroTrackingService to include User-Agent header in all HTTP requests to Allegro API.
- Updated .env.example to include APP_VERSION and ALLEGRO_USER_AGENT_URL for configuration.
- Created public /info page to provide application details required by Allegro, including app name, version, description, and contact information.
- Added minimalist layout for public pages to ensure a professional appearance.
- Ensured all changes comply with Allegro's API requirements for User-Agent header.

routes/web.php

@@ -72,6 +72,7 @@ use App\Modules\Printing\PrintApiController;
 use App\Modules\Printing\PrintApiKeyRepository;
 use App\Modules\Printing\PrintJobRepository;
 use App\Modules\Settings\PrintSettingsController;
+use App\Modules\Info\InfoController;
 use App\Modules\Users\UsersController;
 
 return static function (Application $app): void {
@@ -392,6 +393,9 @@ return static function (Application $app): void {
         }
     };
 
+    $infoController = new InfoController($template);
+    $router->get('/info', [$infoController, 'show']);
+
     $router->get('/health', static fn (Request $request): Response => Response::json([
         'status' => 'ok',
         'app' => (string) $app->config('app.name', 'orderPRO'),