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/server.js

@@ -0,0 +1,11 @@
+process.env.JFLOW_ROLE = "api";
+
+import { startApp } from "./start-app.js";
+
+// HTTP API + cron enqueue only. Schema migrations are owned by control.
+await startApp({
+  role: "api",
+  migrate: false,
+  // In PM2/split mode the Vite/control process serves the SPA.
+  serveStaticUi: process.env.JFLOW_SERVE_UI === "1",
+});