Add SMS OTP auth, discounts, customer orders, and category slugs.

Co-authored-by: Cursor <cursoragent@cursor.com>

prisma/schema.prisma

@@ -49,6 +49,8 @@ model User {
   refreshTokens    RefreshToken[]
   addresses        UserAddress[]
   orders           Order[]
+  discounts        Discount[]        @relation("DiscountAssignee")
+  discountsCreated Discount[]        @relation("DiscountCreatedBy")
 
   @@index([role])
   @@index([disabled])
@@ -80,6 +82,27 @@ model RefreshToken {
   @@index([tokenHash])
 }
 
+enum SmsOtpPurpose {
+  register
+  login
+  resetPassword
+}
+
+model SmsOtp {
+  id        String        @id @default(cuid())
+  cellNumber String
+  purpose   SmsOtpPurpose
+  codeHash  String
+  /// Pending registration fields (firstName, lastName, title, passwordHash)
+  payload   Json?
+  attempts  Int           @default(0)
+  expiresAt DateTime
+  createdAt DateTime      @default(now())
+
+  @@index([cellNumber, purpose])
+  @@index([expiresAt])
+}
+
 model Flavor {
   id                   String                @id @default(cuid())
   nameFa               String
@@ -94,6 +117,7 @@ model Category {
   id           String                @id @default(cuid())
   nameFa       String
   nameEn       String
+  slug         String                @unique
   parentId     String?
   parent       Category?             @relation("CategoryTree", fields: [parentId], references: [id], onDelete: Restrict)
   children     Category[]            @relation("CategoryTree")
@@ -102,6 +126,7 @@ model Category {
   updatedAt    DateTime              @updatedAt
   optionBlocks CategoryOptionBlock[]
   products     Product[]
+  discounts    Discount[]
 
   @@index([parentId])
 }
@@ -215,7 +240,9 @@ model Order {
   shippingAddressLine    String?
   shippingLandline       String?
   note                   String        @default("")
-  itemCount              Int
+  discountCode           String?
+  discountAmount         Int           @default(0)
+  itemCount              Float
   totalPrice             Int
   createdAt              DateTime      @default(now())
   updatedAt              DateTime      @updatedAt
@@ -234,7 +261,7 @@ model OrderItem {
   productId  String?
   product    Product?          @relation(fields: [productId], references: [id], onDelete: SetNull)
   nameFa     String
-  quantity   Int
+  quantity   Float
   unitPrice  Int
   sellUnit   SellUnit
   sortOrder  Int               @default(0)
@@ -254,3 +281,25 @@ model OrderItemOption {
 
   @@index([orderItemId])
 }
+
+model Discount {
+  id               String    @id @default(cuid())
+  code             String    @unique
+  categoryId       String?
+  category         Category? @relation(fields: [categoryId], references: [id], onDelete: SetNull)
+  userId           String?
+  user             User?     @relation("DiscountAssignee", fields: [userId], references: [id], onDelete: Cascade)
+  minOrderAmount   Int       @default(0)
+  expiresAt        DateTime
+  percent          Int
+  maxValue         Int
+  active           Boolean   @default(true)
+  createdByAdminId String?
+  createdByAdmin   User?     @relation("DiscountCreatedBy", fields: [createdByAdminId], references: [id], onDelete: SetNull)
+  createdAt        DateTime  @default(now())
+  updatedAt        DateTime  @updatedAt
+
+  @@index([userId])
+  @@index([categoryId])
+  @@index([active, expiresAt])
+}