RefundTaskQuota 统一的任务失败退款逻辑。 当异步任务失败时，退还资金与令牌额度，并回减用户和渠道用量。 返回资金来源是否已成功退还；失败时保留 quota，供显式重试或人工对账。

UpdateWithStatus performs a conditional UPDATE guarded by fromStatus (CAS). Returns (true, nil) if this caller won the update, (false, nil) if another

UsedVars returns the set of identifier names referenced by an expression. The result is cached alongside the compiled program. Returns nil for empty i

UserSubject is the casbin subject string for a single user.

recordManageAuditFor 记录一条管理审计日志，日志归属于操作者；targetUserId 只表示被操作用户，用于在结构化参数中保留目标上下文。

DeleteMany accepts either fully namespaced keys or raw keys and deletes them. It returns a map keyed by fully namespaced keys.

GetGeminiSettings 获取Gemini配置

HasChannelMeta reports whether upstream channel information is attached; converters use it to decide if GetUpstreamModelName is meaningful.

PrepareMidjourneyTaskBilling sets the durable refund marker before the task is inserted.

RecalculateTaskQuota 通用的异步差额结算。 actualQuota 是任务完成后的实际应扣额度，与预扣额度 (task.Quota) 做差额结算。 reason 用于日志记录（例如 "token重算" 或 "adaptor调整"）。 clamps 可选：若计算 actualQuo

ResetProxyClientCache clears cached proxy and non-default direct policy clients and closes idle connections on every transport/shard. The package-leve

func (info *RelayInfo) SetPromptTokens(promptTokens int) { info.promptTokens = promptTokens }

SetToolPriceForTest injects a tool price and rebuilds the lookup index. Tests only.

T translates a message key using the language from gin context

--------------------------------------------------------------------------- BuildTieredTokenParams: token normalization and ratio parity tests -------

GetResultURL 获取任务结果 URL（视频地址等） 新数据存在 PrivateData.ResultURL 中；旧数据回退到 FailReason（历史兼容）

GetSSRFProtectedHTTPClient 返回带拨号时 SSRF 校验的客户端。 ssrfProtectedHTTPClient 由 InitHttpClient 在启动时初始化，运行期只读。

GetUserSessionCached validates cached state first and falls back to the database on a miss or Redis read failure. A deny tombstone never falls back.