Return relative image paths from API for Next.js frontend

Changed getFeaturedImageUrlAttribute to return relative paths
(e.g., /images/blog/photo.jpg) instead of full Laravel storage URLs.
Migrated image paths updated from migrated-images/ to images/ prefix.
Images are now served from Next.js public/ directory via Vercel CDN.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Models/Article.php

@@ -447,6 +447,7 @@ class Article extends Model
             return null;
         }
 
-        return asset('storage/'.$this->featured_image_path);
+        // Return relative path for Next.js frontend (images served from public/)
+        return '/'.$this->featured_image_path;
     }
 }