encapsulate for environment variable reference

[EQ3A2A]

def fact_check(openai_api_key, serper_api_key, scraper_api_key, model, message, response, category):
    os.environ['SCRAPER_API_KEY'] = ''"

ToDo

• modify this kind of function and the init functon of classes.
• compatible for the hugging face space to avoid API key leak.