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.

prisma/schema/schema.prisma

@@ -1,7 +1,8 @@
 generator client {
-  provider     = "prisma-client"
-  output       = "../../src/generated/prisma"
-  moduleFormat = "cjs"
+  provider        = "prisma-client"
+  output          = "../../src/generated/prisma"
+  moduleFormat    = "cjs"
+  previewFeatures = ["views"]
 }
 
 datasource db {