fix(auth-service): 返回完整手机号，修复QR码扫码失败

- login/profile 接口返回 user.phone.value 替代 user.phone.masked
- 根因：QR码编码脱敏号 199****9327，正则要求纯数字匹配失败

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/auth-service/src/application/services/auth.service.ts

@@ -347,7 +347,7 @@ export class AuthService {
       expiresIn,
       user: {
         accountSequence: user.accountSequence.value,
-        phone: user.phone.masked,
+        phone: user.phone.value,
         source: user.source,
         kycStatus: user.kycStatus,
       },

backend/services/auth-service/src/application/services/user.service.ts

@@ -42,7 +42,7 @@ export class UserService {
 
     return {
       accountSequence: user.accountSequence.value,
-      phone: user.phone.masked,
+      phone: user.phone.value,
       source: user.source,
       status: user.status,
       kycStatus: user.kycStatus,