feat: enhance train scheduling and contract management features

- Added StationWorkControls to manage loading/unloading phases in TrainScheduleV2DetailPage.
- Implemented API endpoints for recording station work and managing wagon detach requests.
- Updated contract templates to include Ethiopian customs handling options.
- Enhanced shipment forms to collect customs clearing agent details for without-customs bookings.
- Introduced NUMBER_OF_WAGONS as a unit of measure for bulk cargo, allowing customers to specify wagon counts.
- Improved validation for customs clearing agent information in shipment forms.
- Updated various components and services to accommodate new features and ensure data integrity.

apps/edr-freight-web/backoffice/src/pages/ruleEngine/CargoTypesPage.tsx

@@ -95,6 +95,7 @@ const FORM_FIELDS: FormFieldDef[] = [
       { label: "None", value: RULE_ENGINE_SELECT_NONE },
       { label: "Per ton (bulk)", value: "PER_TON" },
       { label: "Per item (break-bulk)", value: "PER_ITEM" },
+      { label: "Based on number of wagons", value: "NUMBER_OF_WAGONS" },
     ],
   },
   {
@@ -597,7 +598,11 @@ function CargoRow({
               {node.unitOfMeasure ? (
                 <Tooltip label="How bookings measure this cargo" withArrow>
                   <Badge size="xs" variant="light" color="teal" radius="sm">
-                    {node.unitOfMeasure === "PER_ITEM" ? "Per item" : "Per ton"}
+                    {node.unitOfMeasure === "PER_ITEM"
+                      ? "Per item"
+                      : node.unitOfMeasure === "NUMBER_OF_WAGONS"
+                        ? "By wagons"
+                        : "Per ton"}
                   </Badge>
                 </Tooltip>
               ) : null}