fix over consume by code, revert migration overconsume sell

internal/common/service/fifo_stock_v2/allocate.go

@@ -195,9 +195,12 @@ func (s *fifoStockV2Service) allocateInternal(ctx context.Context, tx *gorm.DB,
 
 	if remaining > 0 {
 		if !allowOverConsume {
-			return nil, fmt.Errorf("%w: requested %.3f, allocated %.3f", ErrInsufficientStock, req.NeedQty, result.AllocatedQty)
+			s.logger.Warnf("FIFO v2: clearing historical pending (%.3f) for %s/%d at PW=%d — over-consume is blocked by rule",
+				remaining, req.Usable.LegacyTypeKey, req.Usable.ID, req.ProductWarehouseID)
+			result.PendingQty = 0
+		} else {
+			result.PendingQty = remaining
 		}
-		result.PendingQty = remaining
 	}
 
 	if err := s.applyUsableDeltas(tx, *usableRule, req.Usable.ID, result.AllocatedQty, result.PendingQty); err != nil {