查询总额度

curl https://www.qingbo.dev/v1/dashboard/billing/subscription \
  -H "Authorization: Bearer $WAVE_API_KEY"

{
  "object": "billing_subscription",
  "has_payment_method": true,
  "hard_limit_usd": 20,
  "soft_limit_usd": 20,
  "system_hard_limit_usd": 20,
  "access_until": 0
}