Fix: Job to check invoice due dates was never run

Made it a command so it runs with the scheduler

app/Console/Kernel.php

@@ -14,6 +14,7 @@ class Kernel extends ConsoleKernel
      */
     protected $commands = [
         \App\Console\Commands\CaldavSyncCommand::class,
+        \App\Console\Commands\CheckInvoiceDueDatesCommand::class,
     ];
 
     /**
@@ -21,6 +22,14 @@ class Kernel extends ConsoleKernel
      */
     protected function schedule(Schedule $schedule): void
     {
+        $schedule->command('caldav:sync')
+            ->everyMinute()
+            ->withoutOverlapping();
+
+        // Run synchronously on schedule to support environments without queue workers
+        $schedule->command('invoices:check-due')
+            ->dailyAt('3:00')
+            ->withoutOverlapping();
     }
 
     /**
@@ -32,4 +41,4 @@ protected function commands(): void
 
         require base_path('routes/console.php');
     }
-}
+}