Refactor sales pipeline: ShopPO, Invoice, SysConfig models

Major refactor replacing Sale/Order with ShopPO → Invoice → LoadingSheet flow. Removed legacy Sale/Order models and features; introduced ShopPO, ShopPOItem, Invoice, LoadingSheetOrder, and SysConfig models. Updated related entities, enums, repositories, and controllers. Added new migrations for schema changes and system config. Overhauled business logic and DI registrations. Updated documentation with migration plan.

Distribution/Features/LoadingEvent/LoadingSheetDTOs.cs

@@ -5,37 +5,27 @@ namespace Distribution.Features.LoadingEvent;
 public record LoadingSheetResponse(
     Guid Id,
     Guid FK_RideId,
-    Guid FK_SourceWarehouseId,
-    string WarehouseName,
     LoadingSheetStatus Status,
-    DateTime? DispatchConfirmedAt,
-    Guid? DispatchConfirmedBy,
-    DateTime? ReceiptConfirmedAt,
-    Guid? ReceiptConfirmedBy,
+    Guid PopulatedBy,
+    DateTime PopulatedAt,
+    DateTime? ConfirmedAt,
+    Guid? ConfirmedBy,
     DateTime CreatedAt,
-    List<LoadingSheetItemResponse> Items);
+    List<LoadingSheetItemResponse> Items,
+    List<LoadingSheetOrderResponse> Orders);
 
 public record LoadingSheetItemResponse(
     Guid Id,
     Guid FK_ItemId,
     string ItemName,
+    Guid FK_WarehouseId,
+    string WarehouseName,
     decimal QuantityDispatched,
-    decimal? QuantityReceived,
-    decimal? QuantityResolved);
+    Guid? FK_ShopPOItemId);
+
+public record LoadingSheetOrderResponse(Guid ShopPOId);
 
 public record CreateLoadingSheetRequest(Guid FK_RideId);
 
 public record SetItemsRequest(List<SetItemInput> Items);
-public record SetItemInput(Guid FK_ItemId, decimal Quantity);
-
-public record SetReceiptItemsRequest(List<ReceiptItemInput> Items);
-public record ReceiptItemInput(Guid FK_ItemId, decimal QuantityReceived);
-
-public record ConfirmReceiptRequest(int Meterstart);
-
-public record ResolveDiscrepancyRequest(List<ResolveItemInput> Items, int Meterstart);
-public record ResolveItemInput(Guid FK_ItemId, decimal QuantityResolved);
-
-// Combined PATCH endpoints used by the frontend
-public record PatchReceiptItemInput(Guid ItemId, decimal QuantityReceived);
-public record PatchReceiptRequest(List<PatchReceiptItemInput> Items);
+public record SetItemInput(Guid FK_ItemId, Guid FK_WarehouseId, decimal Quantity, Guid? FK_ShopPOItemId = null);