Returns aggregate statistics served from a pre-computed snapshot (refreshed every 5 minutes). Use POST /crypto/stats/refresh to force an immediate refresh. The response header X-Stats-Snapshot-Age-Seconds indicates how many seconds ago the snapshot was computed. The counters cover every retained crypto audit event: the aggregation applies no time predicate, so summary.timeRange is all and the population is bounded only by the audit retention window. summary.snapshotComputedAt is the instant that population was read. This endpoint has no fixed reporting period — for a bounded window call GET /api/v3/audit/platform/stats with startTime and endTime, which echoes the applied bounds back in the same field.