Fix domain detail page: quote domain_id in Alpine.js x-data attribute

Agent-Logs-Url: https://github.com/christianlouis/dmarq/sessions/e56426a2-da63-4f8a-95cc-e05972be9e51

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

backend/app/templates/domain_details.html

@@ -6,7 +6,7 @@
 {% block title %}DMARQ - {{ domain.name }} Details{% endblock %}
 
 {% block content %}
-<div class="container mx-auto py-4" x-data="domainDetailsApp({{ domain_id }})">
+<div class="container mx-auto py-4" x-data="domainDetailsApp('{{ domain_id }}')">
     <nav class="mb-4 text-sm">
         <ol class="flex items-center space-x-2">
             <li><a href="/" class="hover:text-primary">Dashboard</a></li>