Refactor production and stock tests to remove UOM dependency

- Updated production.spec.ts, stock-adjustments.spec.ts, and stock-transfers.spec.ts to eliminate UOM references in API seeder and test cases.
- Adjusted ApiSeeder methods to remove UOM parameters from stock receiving and production template creation.
- Revised documentation to reflect changes in UOM handling, emphasizing that stock is counted in base UOM only.
- Introduced new enums for MeasureUnit and StageQtyUnit to clarify content size and stage input quantities.
- Implemented ItemContent service to validate and normalize content sizes.
- Updated smoke tests to validate production stage inputs expressed in content units, ensuring correct consumption calculations.
- Modified frontend UOM label handling to reflect the removal of per-line UOMs in document lines.

Testing/e2e/specs/stock-transfers.spec.ts

@@ -1,5 +1,5 @@
 import { test, expect, APIRequestContext } from "@playwright/test"
-import { ApiSeeder, newApiContext, Warehouse, Item, Uom, Vendor } from "../support/api"
+import { ApiSeeder, newApiContext, Warehouse, Item, Vendor } from "../support/api"
 import { StockTransferNewPage, StockTransferDetailPage } from "../pages/StockPages"
 
 // Stock transfer flow (Backend/ERPCore/Controllers/StockTransfersController.cs, Frontend
@@ -11,7 +11,6 @@ test.describe("Stock transfers", () => {
   let srcWarehouse: Warehouse
   let destWarehouse: Warehouse
   let vendor: Vendor
-  let uom: Uom
   let item: Item
 
   test.beforeAll(async () => {
@@ -19,7 +18,6 @@ test.describe("Stock transfers", () => {
     seeder = new ApiSeeder(api)
     srcWarehouse = await seeder.firstWarehouse()
     destWarehouse = await seeder.secondWarehouse()
-    uom = await seeder.firstUom()
     vendor = await seeder.createVendor()
     item = await seeder.createItem({ namePrefix: "Transfer Test Item" })
 
@@ -27,7 +25,7 @@ test.describe("Stock transfers", () => {
       warehouseId: srcWarehouse.warehouseId,
       vendorId: vendor.vendorId,
       itemId: item.itemId,
-      uomId: uom.uomId,
+
       qty: 50,
       unitCost: 15,
     })