add endpoints plugin with fleet list view and monitoring drafts

Server-side RMM telemetry plugin: current-snapshot endpointstates plus append-only curated endpointevents, resolved to existing Computer assets by hostname. Adds ADR-010 asset panels (status, services, recent events), dashboard quiet and stability cards, and a minimal Fleet list view that links into existing PC detail pages. Registers the activity sidebar icon and a dev-only sample seeder. Ingest arrives on the generic collector route; the future C# agent design record lives in docs/DESIGN-DECISIONS-agent.md.

frontend/src/api/index.js

@@ -146,6 +146,16 @@ export const machinesApi = {
   }
 }
 
+// Endpoints API (plugin) - fleet telemetry read surface
+export const endpointsApi = {
+  list(params = {}) {
+    return api.get('/endpoints', { params })
+  },
+  get(assetId) {
+    return api.get(`/endpoints/${assetId}`)
+  }
+}
+
 // Computers API (plugin)
 export const computersApi = {
   list(params = {}) {