fix: replace hardcoded static paths with url_for() in admin templates

Use module-specific static route helpers to generate correct paths for
JS files across dev_tools, marketplace, and tenancy templates.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/modules/marketplace/templates/marketplace/admin/background-tasks.html

@@ -8,7 +8,7 @@
 {% block alpine_data %}backgroundTasks(){% endblock %}
 
 {% block extra_scripts %}
-<script src="/static/admin/js/background-tasks.js"></script>
+<script src="{{ url_for('marketplace_static', path='admin/js/background-tasks.js') }}"></script>
 {% endblock %}
 
 {% block content %}

app/modules/marketplace/templates/marketplace/admin/imports.html

@@ -11,7 +11,7 @@
 {% block alpine_data %}adminImports(){% endblock %}
 
 {% block extra_scripts %}
-<script src="/static/admin/js/imports.js"></script>
+<script src="{{ url_for('marketplace_static', path='admin/js/imports.js') }}"></script>
 {% endblock %}
 
 {% block content %}

app/modules/marketplace/templates/marketplace/admin/letzshop.html

@@ -11,7 +11,7 @@
 {% block alpine_data %}adminLetzshop(){% endblock %}
 
 {% block extra_scripts %}
-<script src="/static/admin/js/letzshop.js"></script>
+<script src="{{ url_for('marketplace_static', path='admin/js/letzshop.js') }}"></script>
 {% endblock %}
 
 {% block content %}