feat: add Mattermost bot integration and user notification configuration settings

prisma/schema.prisma

@@ -19,8 +19,9 @@ model User {
   updated_at          DateTime             @updatedAt
   orders              Order[]              @relation("CreatedOrders")
   purchases           Submission[]
-  creator_withdrawals BalanceWithdrawal[]  @relation("CreatorWithdrawals")
-  user_withdrawals    BalanceWithdrawal[]  @relation("UserWithdrawals")
+  creator_withdrawals BalanceWithdrawal[]     @relation("CreatorWithdrawals")
+  user_withdrawals    BalanceWithdrawal[]     @relation("UserWithdrawals")
+  notification_config UserNotificationConfig?
 }
 
 model Order {
@@ -91,3 +92,15 @@ model BalanceWithdrawal {
   creator    User     @relation("CreatorWithdrawals", fields: [creator_id], references: [id], onDelete: Cascade)
   user       User     @relation("UserWithdrawals", fields: [user_id], references: [id], onDelete: Cascade)
 }
+
+model UserNotificationConfig {
+  id                    String   @id @default(uuid())
+  user_id               String   @unique
+  mattermost_channel_id String?
+  telegram_chat_id      String?
+  whatsapp_number       String?
+  is_active             Boolean  @default(true)
+  created_at            DateTime @default(now())
+  updated_at            DateTime @updatedAt
+  user                  User     @relation(fields: [user_id], references: [id], onDelete: Cascade)
+}