feat: complete admin panel and backend admin api migration

apps/api/src/modules/orders/dto/create-order.dto.ts

@@ -1,5 +1,6 @@
 import { Type } from 'class-transformer';
-import { ArrayMinSize, IsArray, IsInt, IsNumber, IsOptional, IsPositive, IsString, Min, ValidateNested } from 'class-validator';
+import { OrderChannel } from '@prisma/client';
+import { ArrayMinSize, IsArray, IsEnum, IsInt, IsNumber, IsOptional, IsPositive, IsString, Min, ValidateNested } from 'class-validator';
 
 export class CreateOrderItemInputDto {
   @IsString()
@@ -31,6 +32,15 @@ export class CreateOrderDto {
   @IsString()
   branchId?: string;
 
+  /**
+   * Which sales channel placed the order. Legacy had no such field because the
+   * two channels lived in separate tables (orders vs orders_orders); the one
+   * Order model carries the distinction here. Defaults to RETAIL.
+   */
+  @IsOptional()
+  @IsEnum(OrderChannel)
+  channel?: OrderChannel;
+
   @IsArray()
   @ArrayMinSize(1)
   @ValidateNested({ each: true })