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Adds Prometheus instrumentation across the checkout funnel, auth flow, Stripe calls, rate limiters, and HTTP middleware (inflight gauge, request and response sizes). Introduces a slog handler that counts log lines by level so the dashboard can show error/warn rates; existing log.Printf calls are routed through slog and counted as info. Backs the new "terminalshop — Service Overview" Grafana dashboard. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>