(feature) Add live refresh for dashboard status panels

Split dashboard priority and host status sections into server-rendered
partials and wire them into the shared refresh hook so operational state
updates without a full page reload.

Refs #36

src/pobsync_server/urls.py

@@ -8,6 +8,8 @@ from pobsync_backend import api, views
 
 urlpatterns = [
     path("", views.dashboard, name="dashboard"),
+    path("dashboard/priority-live/", views.dashboard_priority_live, name="dashboard_priority_live"),
+    path("dashboard/hosts-live/", views.dashboard_hosts_live, name="dashboard_hosts_live"),
     path("changelog/", views.changelog, name="changelog"),
     path("self-check/", views.self_check, name="self_check"),
     path("logs/", views.logs, name="logs"),