feat(monitoring): observability stack + app instrumentation

- /health/ready (DB+MinIO+Casdoor checks, webhook post-deploy gate),
  /metrics via prometheus-fastapi-instrumentator, Sentry/GlitchTip capture,
  X-Request-ID middleware + JSON access logging (PROCUREMENT_LOG_FORMAT)
- server-side analytics (OpenPanel Track API): login, quote lifecycle,
  receipts — fire-and-forget, disabled without env config
- monitoring/ compose project: GlitchTip(+pg), Prometheus(+alerts),
  Grafana(provisioned ERP dashboard), Loki+Promtail, node/postgres
  exporters, cAdvisor — mem-limited (~2.2GB), loopback admin UIs,
  separate from app deploys; erp_shared network for scraping
- frontend: @openpanel/web + @sentry/react (build-arg gated, no-op when
  unset), funnel events (login, wizard steps, quote submitted)
- compose: api healthcheck, observability env wiring, .env.example keys

frontend/src/main.tsx

@@ -6,6 +6,7 @@ import { Toaster } from "sonner";
 import App from "./App";
 import "./styles/globals.css";
 import { queryClient } from "./lib/queryClient";
+import { initAnalytics } from "./lib/analytics";
 
 // بعد از استقرار نسخه‌ی جدید، مرورگری که index.html قدیمی را باز کرده برای
 // بارگذاری chunkهای حذف‌شده 404 می‌گیرد و صفحه خالی می‌ماند. این شنونده،
@@ -15,6 +16,9 @@ window.addEventListener("vite:preloadError", () => {
   window.location.reload();
 });
 
+// Product analytics + GlitchTip error capture — no-ops without VITE_ config.
+initAnalytics();
+
 createRoot(document.getElementById("root")!).render(
   <StrictMode>
     <QueryClientProvider client={queryClient}>