feat: 后端也添加了写了一半的人机验证模块

apps/backend/src/captcha/dto/get-captcha.dto.ts

@@ -0,0 +1,16 @@
+import { IsEnum, IsOptional, IsUUID } from "class-validator";
+
+export enum CaptchaContext {
+    SEND_SMS = 'send_sms',
+    PASSKEY = 'passkey',
+}
+
+export class GetCaptchaDto {
+
+    @IsEnum(CaptchaContext, { message: '无效的context' })
+    context: string;
+
+    @IsOptional()
+    @IsUUID('4', { message: 'userId不合法' })
+    userId?: string;
+}