feat: disable admin setup (#24628)

server/src/services/auth.service.ts

@@ -165,6 +165,11 @@ export class AuthService extends BaseService {
   }
 
   async adminSignUp(dto: SignUpDto): Promise<UserAdminResponseDto> {
+    const { setup } = this.configRepository.getEnv();
+    if (!setup.allow) {
+      throw new BadRequestException('Admin setup is disabled');
+    }
+
     const adminUser = await this.userRepository.getAdmin();
     if (adminUser) {
       throw new BadRequestException('The server already has an admin');