refactor: cleaned main file

core/lifespan.py

@@ -0,0 +1,16 @@
+import contextlib
+
+from fastapi.applications import AppType
+
+from task_management import broker
+
+
+@contextlib.asynccontextmanager
+async def lifespan(app: AppType):
+    if not broker.is_worker_process:
+        await broker.startup()
+
+    yield
+
+    if not broker.is_worker_process:
+        await broker.shutdown()