Fix: InvoicePrintController calling undefined authorize() method

Laravel 13 base Controller has no AuthorizesRequests trait.
Use Gate::authorize() facade instead.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Http/Controllers/InvoicePrintController.php

@@ -3,13 +3,13 @@
 namespace App\Http\Controllers;
 
 use App\Domain\Financial\Models\Invoice;
-use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Gate;
 
 class InvoicePrintController extends Controller
 {
     public function __invoke(Invoice $invoice)
     {
-        $this->authorize('invoices.view');
+        Gate::authorize('invoices.view');
 
         $invoice->load(['items', 'payments', 'billable']);