feat: 重构BOM架构，新增基础设置与虚拟工位管理功能

本次重构删除原有BOM物料清单表，改用工单工艺组合×工艺物料清单作为唯一用料来源；新增系统基础设置表支持WMS地址、日志保留天数等配置，新增虚拟工位作业管理后台接口与前端页签控制功能，同时优化工位号校验逻辑、事件日志自动清理与工单用料查询能力。

bj_power_mes/internal/logic/workpiece.go

@@ -446,9 +446,9 @@ func (s *Service) DoneWorkpiece(ctx context.Context, req DoneReq, operator strin
 	return nil
 }
 
-// backflushWorkpiece 反冲扣账：按工单产品整份 BOM 算「单件消耗(含损耗)」，
+// backflushWorkpiece 反冲扣账：按工单工艺组合的单台用料（工艺物料清单汇总，含损耗）算「单件消耗」，
 // 调 WMS 内部反冲接口 FIFO 扣库存 + 生成 backflush 出库单。
-// 整份 BOM 一次性下发（完工即全部物料已消耗），WMS 不可达/校验失败仅记日志。
+// 用料唯一来源=工单组合×flow_material（BOM 已删除）；WMS 不可达/校验失败仅记日志。
 func (s *Service) backflushWorkpiece(ctx context.Context, wp *ent.Workpiece, operator string) {
 	wo, err := s.ctx.EntClient.WorkOrder.Get(ctx, wp.WorkOrderId)
 	if err != nil || wo == nil {
@@ -456,19 +456,16 @@ func (s *Service) backflushWorkpiece(ctx context.Context, wp *ent.Workpiece, ope
 			"反冲失败：工单不存在", map[string]any{"workOrderId": wp.WorkOrderId})
 		return
 	}
-	bom, err := s.ListBom(ctx, wo.ProductCode, bomNameOrDefault(""))
-	if err != nil || len(bom) == 0 {
+	usage := s.WorkOrderUnitUsage(ctx, wo)
+	if len(usage) == 0 {
 		s.ctx.EventLog.Write(ctx, "wms.backflush.skip", wp.OrderNo, operator, "workpiece", wp.Sn,
-			"无BOM物料，跳过反冲", map[string]any{"productCode": wo.ProductCode})
+			"工单工艺组合无物料清单，跳过反冲", map[string]any{"orderNo": wp.OrderNo})
 		return
 	}
-	items := make([]wmsclient.BackflushItem, 0, len(bom))
-	for _, it := range bom {
-		if it.MaterialCode == "" {
-			continue
-		}
-		// 单件消耗 = 单台用量 ×(1+损耗率)，四舍五入；≤0 跳过
-		qty := int(math.Round(it.UnitQty * (1 + it.LossRate/100)))
+	items := make([]wmsclient.BackflushItem, 0, len(usage))
+	for _, it := range usage {
+		// 单件消耗 = 单台含损耗用量，四舍五入；≤0 跳过
+		qty := int(math.Round(it.EffQty))
 		if qty <= 0 {
 			continue
 		}
@@ -479,11 +476,11 @@ func (s *Service) backflushWorkpiece(ctx context.Context, wp *ent.Workpiece, ope
 	}
 	if wmsErr := s.ctx.Wms.Backflush(ctx, wp.OrderNo, 0, 0, operator, items); wmsErr != nil {
 		s.ctx.EventLog.Write(ctx, "wms.backflush.failed", wp.OrderNo, operator, "workpiece", wp.Sn,
-			"反冲扣账WMS失败（库存未扣，请人工核查）", map[string]any{"error": wmsErr.Error(), "productCode": wo.ProductCode})
+			"反冲扣账WMS失败（库存未扣，请人工核查）", map[string]any{"error": wmsErr.Error(), "orderNo": wp.OrderNo})
 		return
 	}
 	s.ctx.EventLog.Write(ctx, "wms.backflush", wp.OrderNo, operator, "workpiece", wp.Sn,
-		"反冲扣账已下发WMS", map[string]any{"productCode": wo.ProductCode, "items": len(items)})
+		"反冲扣账已下发WMS", map[string]any{"orderNo": wp.OrderNo, "items": len(items)})
 }
 
 // retainFinishedToWms 完工品回流 WMS 库存。失败仅记日志（wms.finished.retain_failed），