Support OFTv2 Adapter

### Feature Idea

ComfyUI already supports OFT. OFTv2 is better, lighter, and faster:
https://spherelab.ai/oftv2/

It's included in PEFT library:
https://github.com/huggingface/peft/tree/main/src/peft/tuners/oft

And this PR in OneTrainer is waiting for support on the inference side:
https://github.com/Nerogar/OneTrainer/pull/1073/

### Existing Solutions

Here's an implementation for ComfyUI that worked for me & others:
[oftv2.py](https://github.com/user-attachments/files/23443109/oftv2.py)

### Other

_No response_