feat: 后端也添加了写了一半的人机验证模块

apps/backend/src/captcha/captcha.module.ts

@@ -0,0 +1,11 @@
+import { Module } from '@nestjs/common';
+import { CaptchaService } from './captcha.service';
+import { CaptchaController } from './captcha.controller';
+import { CaptchaRateLimitService } from './service/rate-limit';
+
+@Module({
+  providers: [CaptchaService, CaptchaRateLimitService],
+  controllers: [CaptchaController],
+  imports: [],
+})
+export class CaptchaModule { }