feat: implement project status management with 'on_hold' state and associated UI updates

-feat: ability to hard delete projects, plus a soft delete with auto pruning.

templates/partials/projects/project_dashboard.html

@@ -13,6 +13,8 @@
         </div>
         {% if project.status == 'active' %}
             <span class="px-3 py-1 text-xs font-medium bg-green-100 text-green-800 dark:bg-green-900/30 dark:text-green-300 rounded-full">Active</span>
+        {% elif project.status == 'on_hold' %}
+            <span class="px-3 py-1 text-xs font-medium bg-amber-100 text-amber-800 dark:bg-amber-900/30 dark:text-amber-400 rounded-full">On Hold</span>
         {% elif project.status == 'completed' %}
             <span class="px-3 py-1 text-xs font-medium bg-blue-100 text-blue-800 dark:bg-blue-900/30 dark:text-blue-300 rounded-full">Completed</span>
         {% elif project.status == 'archived' %}