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.

Frontend/erp-system/app/print/sales/invoices/[id]/page.tsx

@@ -7,6 +7,7 @@ import { salesApi } from "@/lib/api/sales"
 import { customersApi } from "@/lib/api/customers"
 import { itemsApi } from "@/lib/api/items"
 import { uomsApi } from "@/lib/api/uoms"
+import { baseUomLabel } from "@/lib/uom-label"
 import { warehousesApi } from "@/lib/api/warehouses"
 import { errorMessage } from "@/lib/error-map"
 import { Button } from "@/components/ui/button"
@@ -131,7 +132,7 @@ export default function SalesInvoicePrintPage({ params }: { params: Promise<{ id
                   <div className="font-medium text-foreground">{line.description}</div>
                   <div className="text-xs text-muted-foreground">SKU {items.find((i) => i.itemId === line.itemId)?.sku ?? `#${line.itemId}`}</div>
                 </TableCell>
-                <TableCell>{uoms.find((u) => u.uomId === line.uomId)?.name ?? `#${line.uomId}`}</TableCell>
+                <TableCell>{baseUomLabel(items, uoms, line.itemId)}</TableCell>
                 <TableCell className="text-right">{line.qty.toFixed(2)}</TableCell>
                 <TableCell className="text-right">{line.freeQty > 0 ? line.freeQty.toFixed(2) : "—"}</TableCell>
                 <TableCell className="text-right">{line.unitPrice.toFixed(2)}</TableCell>

Frontend/erp-system/app/print/sales/slips/[id]/page.tsx

@@ -7,6 +7,7 @@ import { salesApi } from "@/lib/api/sales"
 import { customersApi } from "@/lib/api/customers"
 import { itemsApi } from "@/lib/api/items"
 import { uomsApi } from "@/lib/api/uoms"
+import { baseUomLabel } from "@/lib/uom-label"
 import { warehousesApi } from "@/lib/api/warehouses"
 import { usersApi } from "@/lib/api/users"
 import { errorMessage } from "@/lib/error-map"
@@ -123,7 +124,7 @@ export default function SalesSlipPrintPage({ params }: { params: Promise<{ id: s
                   <div className="font-medium text-foreground">{line.description}</div>
                   <div className="text-xs text-muted-foreground">SKU {items.find((i) => i.itemId === line.itemId)?.sku ?? `#${line.itemId}`}</div>
                 </TableCell>
-                <TableCell>{uoms.find((u) => u.uomId === line.uomId)?.name ?? `#${line.uomId}`}</TableCell>
+                <TableCell>{baseUomLabel(items, uoms, line.itemId)}</TableCell>
                 <TableCell className="text-right">{line.qty.toFixed(0)}</TableCell>
                 <TableCell className="text-right">{line.freeQty > 0 ? line.freeQty.toFixed(0) : "—"}</TableCell>
                 <TableCell className="text-right">{line.unitPrice.toFixed(2)}</TableCell>