Method register

src/services/base.py:301–312

注册邮箱服务类 Args: service_type: 服务类型 service_class: 服务类

(cls, service_type: EmailServiceType, service_class: type)

    @classmethod
    def register(cls, service_type: EmailServiceType, service_class: type):
        """
        注册邮箱服务类

        Args:
            service_type: 服务类型
            service_class: 服务类
        """
        if not issubclass(service_class, BaseEmailService):
            raise TypeError(f"{service_class} 必须是 BaseEmailService 的子类")
        cls._registry[service_type] = service_class
        logger.info(f"注册邮箱服务: {service_type.value} -> {service_class.__name__}")

    @classmethod
    def create(