feat(收口): 补齐 8 月迭代缺口并同步 Spec 与证据链

- 新增六对成对迁移 000232–000237：H5 弹窗类型、退款结算标识与申请人备注、优先轮询事实字段与两个新终态、通道阈值命中留痕、手机号最近解绑人、提现资格校验留痕
- 退款：原因必填与申请人备注、来源支付与渠道流水冻结、线下处理流水号补录审计、按订单查询可选退款方式、企微审批材料补齐且新增字段缺失映射即明确失败
- 优先轮询：人工关闭、有效期到期独立周期任务、失败与过期人工重触发、事实字段与异常重试查询、资产解析端点只读投影
- 通道阈值：命中事实同事务留痕与命中记录查询；员工账单：列表筛选与详情投影；商户池：列表投影与统计周期语义；H5：弹窗类型与类别排序
- 手机号：有效关联数量与最近解绑人、短信验证码失败次数限制；导出：佣金明细十五列与报表序号列
- 时间筛选：三处新增筛选纳入统一严格解析契约，员工账单产生时间参数改名
- 同步 12 份主 Spec 需求、两端点与异步任务证据链，门禁 context-health 与 OpenSpec 校验通过

internal/exporter/refund_scene.go

@@ -43,6 +43,7 @@ func (s *RefundDataSource) Headers(context.Context, ExportParams) ([]string, err
 		"当前退款套餐已用量(MB)", "当前退款套餐总量(MB)", "原订单金额(元)",
 		"实收金额(元)", "可退金额(元)", "申请退款金额(元)", "实际退款金额(元)", "状态", "退款方式",
 		"冻结实收金额(元)", "渠道退款状态", "渠道退款流水号", "渠道退款金额(元)", "失败分类", "异常标记",
+		"来源支付单号", "原支付渠道交易流水号", "线下退款处理流水号",
 		"退款原因", "审批备注",
 		"审批来源", "审批状态", "退款处理状态", "退款申请时间", "退款审批时间", "提交人", "退款凭证",
 	}, nil
@@ -70,6 +71,9 @@ func (s *RefundDataSource) Fetch(ctx context.Context, params ExportParams, offse
 			r.channel_refund_status,
 			r.channel_refund_no,
 			r.channel_refund_amount,
+			r.source_payment_no,
+			r.original_channel_trade_no,
+			r.offline_settlement_no,
 			r.failure_reason,
 			r.anomaly_flag,
 			r.refund_reason,
@@ -146,6 +150,9 @@ func (s *RefundDataSource) Fetch(ctx context.Context, params ExportParams, offse
 			constants.RefundChannelStatusName(item.ChannelRefundStatus),
 			item.ChannelRefundNo,
 			formatMoneyYuan(item.ChannelRefundAmount),
+			item.SourcePaymentNo,
+			item.OriginalChannelTradeNo,
+			item.OfflineSettlementNo,
 			constants.RefundFailureReasonName(item.FailureReason),
 			formatRefundAnomalyFlag(item.AnomalyFlag),
 			item.RefundReason,
@@ -203,6 +210,9 @@ type refundExportRow struct {
 	ChannelRefundStatus        int        `gorm:"column:channel_refund_status"`
 	ChannelRefundNo            string     `gorm:"column:channel_refund_no"`
 	ChannelRefundAmount        int64      `gorm:"column:channel_refund_amount"`
+	SourcePaymentNo            string     `gorm:"column:source_payment_no"`
+	OriginalChannelTradeNo     string     `gorm:"column:original_channel_trade_no"`
+	OfflineSettlementNo        string     `gorm:"column:offline_settlement_no"`
 	FailureReason              string     `gorm:"column:failure_reason"`
 	AnomalyFlag                int        `gorm:"column:anomaly_flag"`
 	RefundReason               string     `gorm:"column:refund_reason"`