feat(cardex): implement cardex controller, service, and DTO for stock movements

feat(pos): add POS controller and service for order creation and stock retrieval
refactor(pos): enhance stock and product category retrieval with pagination and mapping

src/modules/pos/pos.module.ts

@@ -0,0 +1,11 @@
+import { Module } from '@nestjs/common'
+import { PrismaModule } from '../../prisma/prisma.module'
+import { PosController } from './pos.controller'
+import { PosService } from './pos.service'
+
+@Module({
+  imports: [PrismaModule],
+  controllers: [PosController],
+  providers: [PosService],
+})
+export class PosModule {}