RapidAPI logs, detailed admin view, and traffic analytics

## What is new - API logs now store `X-RapidAPI-*` metadata for better diagnostics. - `/admin/logs` has a dedicated detail page with richer request context. - Log search supports `X-RapidAPI-User`. - Admin statistics include 24h traffic analysis and anomaly hints. ## Why this matters Teams can now understand who called the API, from where, and whether request volume is normal for the last 24h.