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/Models/Template.php

@@ -15,6 +15,8 @@ use Illuminate\Database\Eloquent\Relations\HasMany;
     'file_path',
     'thumbnail_path',
     'is_active',
+    'is_ai_enabled',
+    'ai_repeatable_slide_number',
     'created_by',
 ])]
 class Template extends Model
@@ -58,6 +60,8 @@ class Template extends Model
     {
         return [
             'is_active' => 'boolean',
+            'is_ai_enabled' => 'boolean',
+            'ai_repeatable_slide_number' => 'integer',
         ];
     }
 }