feat(web): add Ops page and proxy control on :8600

Vite listens on 8500 and proxies /ops to the control plane. Admin Ops UI
covers pause/resume, scale, drain/force restart, and restart-needed banner.

Co-authored-by: Nasyarobby Putra <nasyarobby@gmail.com>

packages/server/worker.js

@@ -0,0 +1,10 @@
+process.env.JFLOW_ROLE = "worker";
+
+import { startApp } from "./start-app.js";
+
+// BullMQ worker only. Schema migrations are owned by control.
+await startApp({
+  role: "worker",
+  migrate: false,
+  serveStaticUi: false,
+});