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- Add OpenTelemetry SDK with tracing, metrics, and OTLP export for API and worker - Integrate Grafana Faro for frontend real-user monitoring - Instrument health checks, database, Bull queues, and HTTP exception filter - Add Grafana dashboard JSON for service overview - Remove deprecated apps/web-nj (Next.js) — fully replaced by Vite+React frontend - Update nginx config with OTEL collector proxy - Minor UI fixes in schema viewer, category components, and subscription flow Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>