feat: Phase 2 W7-8 production readiness — QR menu, analytics, E2E tests, observability
- Public QR menu: BFF proxy endpoints (no auth), PosDataService public methods
- Revenue analytics + staff performance: Dapper queries, validators, BFF proxy
- Playwright E2E tests: 8 spec files covering auth, admin, 5 POS verticals, reports
- Observability: Grafana dashboard (HTTP metrics, infra, business), Prometheus alert rules
- Fixes: validator frozen-date bug (Must vs LessThanOrEqualTo), PublicMenuController logging + CancellationToken
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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