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- fetchUsage 显式识别 UsageInfo.Error/ErrorCode/NeedsReauth/IsBanned/IsForbidden (antigravity/grok 等平台失败不走 Go error 通道,此前会被误判为 operational) - 凭据失效语义(401/403)标记 CredentialInvalid → failed 状态; grok quota_unknown 已知未知态豁免不判失败 - 失败快照进 60s 负缓存,避免故障/凭据失效期间以最小 15s 间隔打上游 - 同账号并发抓取由 singleflight 合并(脱离调用方 ctx,45s 总超时兜底)