- Implement Follow and UserAnimeList models to allow user following and anime list tracking (watchlist, completed, dropped).
- Add `is_public` boolean field to User model for privacy control.
- Create serializers and ViewSets (FollowViewSet, UserAnimeListViewSet) with correct object-level permissions (IsOwnerOrReadOnly) to prevent IDOR vulnerabilities.
- Add `ActivityFeedViewSet` to aggregate recent badge and watch log activities of followed users.
- Add DRF routers in main `urls.py`.
- Include `test_social.py` with comprehensive API tests.
- Resolve migration conflict automatically using `--merge`.
Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>