feat(api): add AI text-to-deck generation, wallet deposit structure, and profile/notification endpoints

Fills the gaps between the admin panel screens and the backend: a full
free-text + slide-count + language -> AI-generated presentation flow with
new slide-cloning logic in TemplateFillService, a "my presentations" list
endpoint, a swappable payment-gateway structure for wallet top-ups (fake
driver for now), and avatar upload / public-profile toggle / account
deletion / password change / notification preference endpoints.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/Providers/AppServiceProvider.php

@@ -2,6 +2,7 @@
 
 namespace App\Providers;
 
+use App\Contracts\PaymentGateway;
 use App\Models\Notification;
 use App\Models\Permission;
 use App\Models\Role;
@@ -15,6 +16,7 @@ use App\Policies\RolePolicy;
 use App\Policies\UserPolicy;
 use App\Policies\WalletPolicy;
 use App\Policies\WalletTransactionPolicy;
+use App\Services\Payments\FakePaymentGateway;
 use Illuminate\Support\Facades\Gate;
 use Illuminate\Support\Facades\URL;
 use Illuminate\Support\ServiceProvider;
@@ -26,7 +28,8 @@ class AppServiceProvider extends ServiceProvider
      */
     public function register(): void
     {
-        //
+        // Swap this binding for a real gateway (ZarinPal, Zibal, ...) once one is integrated.
+        $this->app->bind(PaymentGateway::class, FakePaymentGateway::class);
     }
 
     /**