🚚 Refactor and simplify backend file structure (#609)

src/backend/app/worker.py

@@ -0,0 +1,11 @@
+from raven import Client
+
+from app.core.celery_app import celery_app
+from app.core.config import settings
+
+client_sentry = Client(settings.SENTRY_DSN)
+
+
+@celery_app.task(acks_late=True)
+def test_celery(word: str) -> str:
+    return f"test task return {word}"