Add PriceList functionality with RetailPrice and AgencyMarginPercent

Distribution/Features/PriceList/PriceListDTOs.cs

@@ -2,16 +2,30 @@ namespace Distribution.Features.PriceList;
 
 public record CreatePriceListRequest(string Name, Guid? RegionId, DateTime EffectiveFrom, DateTime EffectiveTo);
 
-public record UpdatePriceListRequest(string Name, Guid? RegionId, DateTime EffectiveFrom, DateTime EffectiveTo);
+public record UpdatePriceListRequest(string Name, Guid? RegionId, DateTime EffectiveFrom, DateTime EffectiveTo, bool IsActive);
 
-public record UpsertPriceListItemRequest(decimal Price, decimal? MinPrice = null);
+public record UpsertPriceListItemRequest(
+    decimal Price,
+    decimal? MinPrice = null,
+    decimal? RetailPrice = null,
+    decimal? AgencyMarginPercent = null);
 
-public record PriceListItemResponse(Guid Id, Guid ItemId, string Sku, string ItemName, decimal Price, decimal? MinPrice);
+public record PriceListItemResponse(
+    Guid Id,
+    Guid ItemId,
+    string Sku,
+    string ItemName,
+    decimal Price,
+    decimal? MinPrice,
+    decimal? RetailPrice,
+    decimal? AgencyMarginPercent);
 
 /// <summary>
-/// A resolved price with its negotiable floor. MinPrice null = no negotiation, Price is fixed.
+/// A resolved price with its negotiable floor, plus the informational retail price and agency
+/// margin when the resolution came from an actual PriceListItem (both null on the Item.SalePrice
+/// fallback, since neither is tracked at the item level).
 /// </summary>
-public record PriceResolution(decimal Price, decimal? MinPrice);
+public record PriceResolution(decimal Price, decimal? MinPrice, decimal? RetailPrice, decimal? AgencyMarginPercent);
 
 public record PriceListResponse(
     Guid Id,