fix(auth): AliyunSmsProvider 使用 SendSmsRequest 构造请求对象

修复 request.validate is not a function 错误，
dysmsapi v3 SDK 的 sendSms() 需要 SendSmsRequest 实例而非 plain object。

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/services/auth-service/src/infrastructure/sms/aliyun-sms.provider.ts

@@ -35,12 +35,15 @@ export class AliyunSmsProvider implements ISmsProvider {
       const signName = process.env.ALIYUN_SMS_SIGN_NAME || '券金融';
       const templateCode = this.getTemplateCode(type);
 
-      const result = await client.sendSms({
+      // eslint-disable-next-line @typescript-eslint/no-var-requires
+      const { SendSmsRequest } = require('@alicloud/dysmsapi20170525');
+      const request = new SendSmsRequest({
         phoneNumbers: phoneNumber,
         signName,
         templateCode,
         templateParam,
       });
+      const result = await client.sendSms(request);
 
       if (result.body?.code === 'OK') {
         return {