feat: implement POS order management system

- Added CreateOrderDto and CreateOrderItemDto for order creation.
- Developed PosOrdersController to handle order-related endpoints.
- Created PosOrdersService for business logic related to orders.
- Implemented PosOrdersWorkflow for order processing workflows.
- Established Prisma integration for database operations in orders.
- Introduced SalesInvoicesModule and related DTOs for sales invoice management.
- Enhanced SalesInvoicesService and SalesInvoicesWorkflow for invoice processing.

src/modules/pos/pos.module.ts

@@ -1,10 +1,11 @@
 import { Module } from '@nestjs/common'
 import { PrismaModule } from '../../prisma/prisma.module'
+import { PosOrdersModule } from './orders/orders.module'
 import { PosController } from './pos.controller'
 import { PosService } from './pos.service'
 
 @Module({
-  imports: [PrismaModule],
+  imports: [PrismaModule, PosOrdersModule],
   controllers: [PosController],
   providers: [PosService],
 })