feat(website-type): add footer logo support in WebsiteType model, controller, and resource; update seeder and tests

app/Domains/Tenant/Models/WebsiteType.php

@@ -25,6 +25,7 @@ use Illuminate\Database\Eloquent\Relations\HasMany;
     'border_color',
     'login_header_footer_color',
     'site_logo',
+    'footer_logo',
 ])]
 class WebsiteType extends Model
 {
@@ -40,6 +41,14 @@ class WebsiteType extends Model
         return $this->belongsTo(Attachment::class, 'site_logo');
     }
 
+    /**
+     * @return BelongsTo<Attachment, $this>
+     */
+    public function footerLogo(): BelongsTo
+    {
+        return $this->belongsTo(Attachment::class, 'footer_logo');
+    }
+
     /**
      * @return HasMany<WebsiteTypeExtra, $this>
      */