wget protenix-v2 gives 403 error

I tried running inference with the new `protenix-v2` model, and get a 403 error when the inference pipeline attempts to download the checkpoint. In isolation I get the same error:

```
wget "https://protenix.tos-cn-beijing.volces.com/checkpoint/protenix-v2.pt"
--2026-04-08 15:48:52-- https://protenix.tos-cn-beijing.volces.com/checkpoint/protenix-v2.pt
Resolving protenix.tos-cn-beijing.volces.com (protenix.tos-cn-beijing.volces.com)... 221.194.175.109, 42.81.80.87, 42.81.80.86, ...
Connecting to protenix.tos-cn-beijing.volces.com (protenix.tos-cn-beijing.volces.com)|221.194.175.109|:443... connected.
HTTP request sent, awaiting response... 403 Forbidden
2026-04-08 15:48:54 ERROR 403: Forbidden.
```

Start by locating the inference pipeline's checkpoint download path and reproduce the failure with the listed wget command against the protenix-v2.pt URL. Check how the pipeline accesses that checkpoint and verify the cause of the 403. Done means the protenix-v2 checkpoint can be downloaded and inference proceeds successfully.

Written by the indexing model from the issue text.