feat: implement currency exchange rate scraping service and command

routes/console.php

@@ -3,6 +3,7 @@
 use Illuminate\Foundation\Inspiring;
 use Illuminate\Support\Facades\Artisan;
 
-Artisan::command('inspire', function () {
-    $this->comment(Inspiring::quote());
-})->purpose('Display an inspiring quote');
+Schedule::command('currency:fetch --today')
+    ->everySixHours() // 
+    ->appendOutputTo(storage_path('logs/currency-fetch.log'));
+