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

prisma/schema.prisma

@@ -10,16 +10,17 @@ datasource db {
 }
 
 model User {
-  id           Int       @id @default(autoincrement())
-  mobileNumber String    @unique @db.Char(11)
-  password     String
-  firstName    String
-  lastName     String
-  roleId       Int
-  createdAt    DateTime  @default(now()) @db.Timestamp(0)
-  deletedAt    DateTime? @db.Timestamp(0)
-  updatedAt    DateTime  @updatedAt @db.Timestamp(0)
-  role         Role      @relation("User_Role", fields: [roleId], references: [id], onUpdate: NoAction)
+  id            Int            @id @default(autoincrement())
+  mobileNumber  String         @unique @db.Char(11)
+  password      String
+  firstName     String
+  lastName      String
+  roleId        Int
+  createdAt     DateTime       @default(now()) @db.Timestamp(0)
+  deletedAt     DateTime?      @db.Timestamp(0)
+  updatedAt     DateTime       @updatedAt @db.Timestamp(0)
+  role          Role           @relation("User_Role", fields: [roleId], references: [id], onUpdate: NoAction)
+  refreshTokens RefreshToken[]
 
   @@index([roleId], map: "Users_roleId_fkey")
   @@map("Users")
@@ -27,7 +28,7 @@ model User {
 
 model Role {
   id          Int       @id @default(autoincrement())
-  name        String    @db.VarChar(100)
+  name        String    @unique() @db.VarChar(100)
   description String?   @db.Text
   permissions Json?
   createdAt   DateTime  @default(now()) @db.Timestamp(0)
@@ -345,6 +346,32 @@ model StockBalance {
   @@map("Stock_Balance")
 }
 
+model OtpCode {
+  id           Int      @id @default(autoincrement())
+  mobileNumber String   @db.VarChar(20)
+  code         String   @db.VarChar(10)
+  used         Boolean  @default(false)
+  expiresAt    DateTime @db.Timestamp(0)
+  createdAt    DateTime @default(now()) @db.Timestamp(0)
+
+  @@index([mobileNumber])
+  @@map("Otp_Codes")
+}
+
+model RefreshToken {
+  id        Int      @id @default(autoincrement())
+  tokenHash String   @db.VarChar(255)
+  userId    Int
+  revoked   Boolean  @default(false)
+  expiresAt DateTime @db.Timestamp(0)
+  createdAt DateTime @default(now()) @db.Timestamp(0)
+
+  user User @relation(fields: [userId], references: [id])
+
+  @@index([userId])
+  @@map("Refresh_Tokens")
+}
+
 model InventoryTransfer {
   id              Int                     @id @default(autoincrement())
   code            String                  @unique @db.VarChar(100)