Feat: Integrate social authentication (Login using fb/google)

この issue には説明がありません。

The issue is for adding social authentication (Facebook/Google) to a Django REST Framework user management app. Look at the existing authentication setup in the codebase, likely in views or serializers. Research Django packages like django-allauth or social-auth-app-django for integration. Check if there are any tests for authentication to understand the expected flow.

索引モデルが issue の本文から書いたものです。