Let setup wizard enable IM channels

backend/tests/test_channels.py

@@ -1986,10 +1986,12 @@ class TestChannelManager:
 
         _run(go())
 
-    def test_same_topic_reuses_thread(self):
+    def test_same_topic_reuses_thread(self, monkeypatch):
         """Messages with the same topic_id should reuse the same DeerFlow thread."""
         from app.channels.manager import ChannelManager
 
+        monkeypatch.delenv("DEER_FLOW_AUTH_DISABLED", raising=False)
+
         async def go():
             bus = MessageBus()
             store = ChannelStore(path=Path(tempfile.mkdtemp()) / "store.json")