copilot.tencent.com's gateway answers 10085 '请求不合法' to a request whose
User-Agent it doesn't know, so the resource-summary meter came back rejected
and the credits window stayed empty; every call to it — chat sign included,
not only billing — now goes out as WorkBuddy/<version>. And the meter sends
its capacities as JSON strings ('3300', '438.88000002'), which wouldn't
unmarshal into float64, so a wbNum type parses either a string or a number.
Verified against the live API (GET /console/accounts + POST
/billing/meter/get-user-resource-summary both 200 with the account's real
credits) from app.asar 5.5.6.