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/inventory.prisma

@@ -47,6 +47,7 @@ model PosAccount {
 
   inventoryBankAccount InventoryBankAccount @relation(fields: [inventoryId, bankAccountId], references: [inventoryId, bankAccountId])
   salesInvoices        SalesInvoice[]
+  orders               Order[]
 
   @@index([inventoryId])
   @@map("Pos_Accounts")

prisma/schema/order.prisma

@@ -1,16 +1,22 @@
 model Order {
-  id          Int         @id @default(autoincrement())
-  orderNumber String      @unique @db.VarChar(100)
-  status      OrderStatus @default(PENDING)
-  totalAmount Decimal     @db.Decimal(15, 2)
-  description String?     @db.Text
-  createdAt   DateTime    @default(now()) @db.Timestamp(0)
-  updatedAt   DateTime    @updatedAt @db.Timestamp(0)
-  deletedAt   DateTime?   @db.Timestamp(0)
-  customerId  Int?
-  customer    Customer?   @relation(fields: [customerId], references: [id], onUpdate: NoAction)
-  orderItems  OrderItem[]
+  id           Int         @id @default(autoincrement())
+  orderNumber  String      @unique @db.VarChar(100)
+  status       OrderStatus @default(PENDING)
+  totalAmount  Decimal     @db.Decimal(15, 2)
+  description  String?     @db.Text
+  createdAt    DateTime    @default(now()) @db.Timestamp(0)
+  updatedAt    DateTime    @updatedAt @db.Timestamp(0)
+  deletedAt    DateTime?   @db.Timestamp(0)
+  customerId   Int?
+  posAccountId Int
 
+  customer   Customer?  @relation(fields: [customerId], references: [id], onUpdate: NoAction)
+  posAccount PosAccount @relation(fields: [posAccountId], references: [id], onUpdate: NoAction)
+
+  orderItems        OrderItem[]
+  stockReservations StockReservation[]
+
+  @@index([posAccountId])
   @@index([customerId])
   @@map("Orders")
 }

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 {

prisma/schema/stock.prisma

@@ -63,15 +63,25 @@ model StockAdjustment {
 model StockReservation {
   id          Int       @id @default(autoincrement())
   quantity    Decimal   @db.Decimal(10, 0)
-  expiresAt   DateTime  @db.Timestamp(0)
   createdAt   DateTime  @default(now()) @db.Timestamp(0)
   productId   Int
   inventoryId Int
   orderId     Int
   inventory   Inventory @relation(fields: [inventoryId], references: [id])
   product     Product   @relation(fields: [productId], references: [id])
+  order       Order     @relation(fields: [orderId], references: [id], onDelete: Cascade)
 
   @@index([inventoryId])
   @@index([productId])
   @@map("Stock_Reservations")
 }
+
+view StockAvailableView {
+  productId         Int
+  inventoryId       Int
+  physicalQuantity  Decimal @db.Decimal(10, 0)
+  reservedQuantity  Decimal @db.Decimal(10, 0)
+  availableQuantity Decimal @db.Decimal(10, 0)
+
+  @@map("Stock_Available_View")
+}