feat: product screenshots gallery

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

app/Models/Product.php

@@ -7,6 +7,7 @@ use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Support\Str;
 
 class Product extends Model
@@ -121,6 +122,14 @@ class Product extends Model
         return $query->exists();
     }
 
+    /**
+     * Get the product's screenshots in display order.
+     */
+    public function screenshots(): HasMany
+    {
+        return $this->hasMany(ProductScreenshot::class)->orderBy('position')->orderBy('id');
+    }
+
     /**
      * Get the user that owns the product.
      */