Get user search activity summary

curl --request GET \
  --url https://your-rootprint-host/api/admin/activity/users/{userId}/summary \
  --cookie better-auth.session_token=

{
  "totalSearches": 123,
  "errorCount": 123,
  "p50": 123,
  "p95": 123,
  "p99": 123,
  "displayName": "<string>",
  "email": "<string>"
}