Is your feature request related to a problem? Please describe.
Yes. Currently, there is no native pipeline in diffusers that supports Unified Multi-Image Conditioning as proposed in UniPic 3.0. https://huggingface.co/Skywork/Unipic3

Describe the solution you'd like.
I propose adding a UniPic 3.0–style pipeline to diffusers that natively supports multi-image, multi-type conditioning within a single diffusion forward pass.

Describe alternatives you've considered.
Extending existing pipelines: Results in model-specific hacks rather than a reusable abstraction. And it's difficult to maintain or generalize.

Additional context.
Add any other context or screenshots about the feature request here.