feat: 添加短信验证码发送记录功能

backend_v1/app/services/users.go

@@ -392,14 +392,25 @@ func (m *users) SendPhoneCode(ctx context.Context, phone string) error {
 	}
 
 	// 生成/覆盖验证码：同一手机号再次发送时以最新验证码为准
+	expiresAt := now.Add(5 * time.Minute)
 	m.codeByPhone[phone] = phoneCodeEntry{
 		code:      code,
-		expiresAt: now.Add(5 * time.Minute),
+		expiresAt: expiresAt,
 	}
 	m.lastSentAtByPhone[phone] = now
 	// log phone and code
 	log.Infof("SendPhoneCode to %s: code=%s", phone, code)
 
+	if _db != nil {
+		// 记录短信验证码发送日志（用于后台审计与排查）。
+		_ = _db.WithContext(ctx).Create(&models.SmsCodeSend{
+			Phone:     phone,
+			Code:      code,
+			SentAt:    now,
+			ExpiresAt: expiresAt,
+		}).Error
+	}
+
 	return nil
 }