feat: add content showcase feature to rate card profiles with PDF rendering support

app/Models/RateCardProfile.php

@@ -17,11 +17,13 @@ class RateCardProfile extends Model
         'past_brands',
         'brand_logo_size',
         'contact_person_html',
+        'content_showcase',
     ];
 
     protected $casts = [
         'show_prices' => 'boolean',
         'past_brands' => 'array',
+        'content_showcase' => 'array',
     ];
 
     /** Get the singleton profile, creating defaults if needed */