Pin bcrypt to 4.0.1, add celery_app entry point

backend/app/workers/celery_app.py

@@ -0,0 +1,7 @@
+"""
+Celery entry point. Re-exports celery_app from tasks so the worker
+can be started with: celery -A app.workers.celery_app worker
+"""
+from app.workers.tasks import celery_app
+
+__all__ = ["celery_app"]

backend/requirements.txt

@@ -6,7 +6,8 @@ alembic==1.13.1
 pydantic==2.7.1
 pydantic-settings==2.2.1
 python-jose[cryptography]==3.3.0
-passlib[bcrypt]==1.7.4
+passlib==1.7.4
+bcrypt==4.0.1
 python-multipart==0.0.9
 httpx==0.27.0
 redis[hiredis]==5.0.4