Since the token plan template became the default for Zhipu cards, pay-as-you-go
accounts showed "query failed": the quota endpoint answers HTTP 200 with
{"code":500,"msg":"当前用户不存在coding plan","success":false}, which looked like
the provider was broken (#8465).
Show the plan when there is one, otherwise the account balance:
- coding_plan: query_coding_plan returns CodingPlanOutcome, with ZhipuNoPlan
for the personal plan when msg says the account has no coding plan. Auth
failures, network errors and other business errors are unchanged.
get_coding_plan_quota keeps its old result (used by the modal test button).
The team plan does not fall back: the balance endpoint ignores the
organization/project headers.
- balance: query_zhipu_balance reads availableBalance from the undocumented
/api/biz/account/query-customer-account-report, which accepts the inference
API key (verified on open.bigmodel.cn, CNY). api.z.ai is assumed to share
the shape and is shown in USD; not verified. Not added to detect_provider so
it does not compete with the injected token plan template.
- The token_plan branch of query_provider_usage returns the balance result on
ZhipuNoPlan; the tray already renders it as a balance line.
- UsageFooter only renders token plan data as tiers when every row is a
percentage, so the fallback balance uses the balance layout.
