feat: Add Krea2OstrisEdit support

[stduhpf]

Summary

Adds support for Krea2 fine-tunes with editing capabilities trained with https://github.com/ostris/ai-toolkit

Ref: Krea2OstrisEdit

Related Issue / Discussion

N/A

Additional Information

Example:

reference image:

prompt: "a white yeti with horns reading a book that is titled "Ostris + Krea2 Style Reference""

style_reference LoRA: https://huggingface.co/ostris/krea2_turbo_style_reference
(also filter bypasss lora applied to the weights directly)

seed: 9499

master (no image conditioning)	No LoRA (with mmproj)	No LoRA (without mmproj)	style_reference LoRA (with mmproj)	style_reference LoRA (without mmproj)

Checklist

• I have read and confirmed this PR follows the contribution guidelines.

[stduhpf]

Bonus: llm-vision only (disabled reference latents for the DiT):

no LoRA	style_reference LoRA

Maybe this could be an option? (what would be the best UI for that?)

[stduhpf]

... and now I find this one, which seems to use different setup:
model: https://huggingface.co/conradlocke/krea2-identity-edit
implentation: https://github.com/lbouaraba/comfyui-krea2edit

• refs are concatenated before the target image rather than after, but since non-causal attention permutation invarient, I'm pretty sure this doesn't matter as long as the RoPE ids are the same
• Uses a slightly different prompt format (probably not that important)
• Does not force timestep=0 for the refs

Just disabling the separate timestep for the refs seems to be enough to make it work pretty well