feat: add notification system database models

server/prisma/schema.prisma

@@ -90,6 +90,8 @@ model User {
   reviews Review[]
   orderMessageReadStates UserOrderMessageReadState[]
   oauthAccounts OAuthAccount[]
+  notificationPreference NotificationPreference?
+  notificationLogs NotificationLog[]
 }
 
 /// Прочитанность чата по заказу (для сообщений от админа после lastReadAt)
@@ -269,3 +271,51 @@ model InfoPageBlock {
 
   @@index([published, sort])
 }
+
+/// Настройки оповещений пользователя
+model NotificationPreference {
+  id                     String   @id @default(cuid())
+  userId                 String   @unique
+  globalEnabled          Boolean  @default(true)
+  orderCreated           Boolean  @default(true)
+  orderStatusChanged     Boolean  @default(true)
+  orderMessageReceived   Boolean  @default(true)
+  paymentStatusChanged   Boolean  @default(true)
+  createdAt              DateTime @default(now())
+  updatedAt              DateTime @updatedAt
+
+  user                   User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+}
+
+/// Настройки оповещений админа
+model AdminNotificationSettings {
+  id                  String   @id @default(cuid())
+  emailEnabled        Boolean  @default(true)
+  telegramEnabled     Boolean  @default(false)
+  telegramChatId      String?
+  newOrder            Boolean  @default(true)
+  newOrderMessage     Boolean  @default(true)
+  newReview           Boolean  @default(true)
+  authCodeDuplicate   Boolean  @default(false)
+  createdAt           DateTime @default(now())
+  updatedAt           DateTime @updatedAt
+}
+
+/// Лог отправки оповещений
+model NotificationLog {
+  id          String   @id @default(cuid())
+  userId      String?
+  eventType   String
+  channel     String
+  status      String
+  error       String?
+  payload     String
+  attempts    Int      @default(0)
+  createdAt   DateTime @default(now())
+  updatedAt   DateTime @updatedAt
+
+  user        User?    @relation(fields: [userId], references: [id], onDelete: SetNull)
+
+  @@index([status, createdAt])
+  @@index([userId, createdAt])
+}