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/TemplateGeneration.php

@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use App\Enums\TemplateGenerationSource;
 use App\Enums\TemplateGenerationStatus;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Model;
@@ -10,6 +11,11 @@ use Illuminate\Database\Eloquent\Relations\BelongsTo;
 #[Fillable([
     'template_id',
     'uuid',
+    'source',
+    'title',
+    'language',
+    'slide_count',
+    'source_text',
     'status',
     'values',
     'output_path',
@@ -40,8 +46,10 @@ class TemplateGeneration extends Model
     protected function casts(): array
     {
         return [
+            'source' => TemplateGenerationSource::class,
             'status' => TemplateGenerationStatus::class,
             'values' => 'array',
+            'slide_count' => 'integer',
         ];
     }
 }