Method delete

pdf2zh/config.py:187–193

删除配置值并保存

(cls, key)

    @classmethod
    def delete(cls, key):
        """删除配置值并保存"""
        instance = cls.get_instance()
        with instance._lock:
            if key in instance._config_data:
                del instance._config_data[key]
                instance._save_config()

    @classmethod
    def clear(cls):