Resolve merge conflict in config.example.json

Removed conflicting lines and kept 'allow_from' as an empty array.

config/config.example.json

@@ -79,14 +79,10 @@
     "whatsapp": {
       "enabled": false,
       "bridge_url": "ws://localhost:3001",
-<<<<<<< main
       "use_native": false,
       "session_store_path": "",
-      "allow_from": []
-=======
       "allow_from": [],
       "reasoning_channel_id": ""
->>>>>>> refactor/channel-system
     },
     "feishu": {
       "enabled": false,
@@ -269,4 +265,4 @@
     "host": "127.0.0.1",
     "port": 18790
   }
-}
+}