curl --request GET \
  --url https://api.mnemom.ai/v1/admin/plans \
  --header 'Authorization: Bearer <token>'

{
  "plans": [
    {
      "plan_id": "<string>",
      "display_name": "<string>",
      "description": "<string>",
      "billing_model": "none",
      "base_price_cents": 123,
      "annual_price_cents": 123,
      "per_check_price": 123,
      "included_checks": 123,
      "trace_retention_days": 123,
      "feature_flags": {},
      "limits": {},
      "sort_order": 123
    }
  ]
}