Merge pull request #60 from RandomProgramm3r/develop

refactor(likes): make like/unlike operations atomic and enhance like action tests

Wrap the like and unlike logic in `django.db.transaction.atomic()` to ensure that the creation/deletion of `Like` records and the corresponding update of the promo’s `like_count` occur as a single, indivisible operation. This prevents race conditions and data inconsistencies. After updating `like_count` using `F()`, call `promo.refresh_from_db()` to reflect the latest database state in the model instance.

Refactor the `TestUserPromoLikeActions` test suite for clarity and maintainability:
- Introduce helper methods (`_create_user_and_get_token`, `_create_promo`, `_auth`, `_get_user_promo`, `_get_business_promo`, `_like`, `_unlike`) to eliminate duplication.  
- Consolidate granular tests into comprehensive cases (`test_initial_promo_state`, `test_like_action`, `test_like_idempotency`, etc.).  
- Remove reliance on ordered execution by cleaning up test data in `tearDown()`, ensuring test isolation and robustness.

Author: RandomProgramm3r