Add endpoint monitor catalog and warn-only drift reconciler

Operators need to see when a machine's running services or processes fall outside the desired state defined by policy. This adds a reusable monitor catalog (shipped read-only rows plus user-built local rows), computes drift server-side on agent check-in, and surfaces a warning on the endpoint panels. Remediation stays manual for now; automation can follow once demand is proven. Includes migrations 0006-0008 and the monitors API client.

plugins/endpoints/frontend/routes.js

@@ -18,6 +18,12 @@ export default [
     component: () => import('./views/AgentKeySettings.vue'),
     meta: { requiresAuth: true, requiresAdmin: true, plugin: 'endpoints' }
   },
+  {
+    path: 'settings/endpoints/monitors',
+    name: 'endpoints-monitors-settings',
+    component: () => import('./views/MonitorsSettings.vue'),
+    meta: { requiresAuth: true, requiresAdmin: true, plugin: 'endpoints' }
+  },
   // TEMPORARY / DEV ONLY. A manual bench to exercise the update_app and
   // run_script delivery path end to end while Cameron builds the real UI.
   // Gated on endpoints.deploy inside the view; remove once the production