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-api/src/modules/contract-templates/dto/contract-template.dto.ts

@@ -43,6 +43,14 @@ export class CreateContractTemplateDto {
   @IsBoolean()
   withCustoms?: boolean;
 
+  @ApiPropertyOptional({
+    description:
+      "Restricts the with-customs variant to Ethiopian-side clearing only (Djibouti stays with the Client). Requires withCustoms=true; rejected for INTERCITY",
+  })
+  @IsOptional()
+  @IsBoolean()
+  ethiopianCustomsOnly?: boolean;
+
   @ApiPropertyOptional({ description: "Display name (derived from the cargo type when omitted)" })
   @IsOptional()
   @IsString()