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/Enums/PaymentGatewayDriver.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Enums;
+
+enum PaymentGatewayDriver: string
+{
+    case Fake = 'fake';
+
+    public function label(): string
+    {
+        return match ($this) {
+            self::Fake => 'درگاه آزمایشی',
+        };
+    }
+}