Registry node extraction pending: mediahub-cloud shows No nodes found

## Summary

`mediahub-cloud` is visible and installable in ComfyUI Manager / Desktop, but the Node Pack Info panel shows `No nodes found`.

This appears to be caused by the Registry version extraction status being stuck at `pending`, even though the version itself is active.

Backend tracking issue: https://github.com/Comfy-Org/registry-backend/issues/185

## Node

- Registry page: https://registry.comfy.org/nodes/mediahub-cloud
- Repository: https://github.com/vantang/ComfyUI-MediaHub
- Version: `0.1.0`
- Version id: `4307177c-bac2-4a96-8558-a69a73ea373f`

## Current Registry API state

```bash
curl -s "https://api.comfy.org/versions?nodeId=mediahub-cloud&include_status_reason=true&pageSize=1" \
| python3 -c "import json,sys; v=json.load(sys.stdin)["versions"][0]; print(v["status"], v.get("comfy_node_extract_status"))"
```

Output on 2026-07-03:

```text
NodeVersionStatusActive pending
```

## Manager / Desktop symptom

In the Node Pack Info panel, the pack is listed as active/installable, but the `NODES` section says:

```text
No nodes found
The pack's nodes either could not be parsed, or the pack is a frontend extension only and doesn't have any nodes.
```

## Expected behavior

Once the Registry node extraction job completes, Manager should show the nodes exported by `NODE_CLASS_MAPPINGS`.

## Notes

The package has a standard ComfyUI custom-node entry point and the nodes load in ComfyUI:

```python
# __init__.py
from .nodes import NODE_CLASS_MAPPINGS, NODE_DISPLAY_NAME_MAPPINGS
WEB_DIRECTORY = "./js"
```

This issue is filed here because Manager/Desktop users see the symptom in this UI. The backend/root tracking issue is Comfy-Org/registry-backend#185.

Start with the linked registry-backend issue and reproduce the API query for version 0.1.0 to inspect its extraction status. Review the package entry point in __init__.py and the exported NODE_CLASS_MAPPINGS, then verify that the Manager Node Pack Info panel lists the extracted nodes once the registry job completes.

Written by the indexing model from the issue text.