Add Wan 2.6 Ultra Fast Image-To-Video Model

We want to add Wan 2.6 Ultra Fast as a new Image-to-Video option.

It would give users a cheaper alternative to Wan 2.6 without sacrificing the features that matter most: audio support, up to 15-second generation, and the same unrestricted workflow. This makes it a great choice for creators who need more video volume at a lower cost.

Key benefits:

• More affordable than Wan 2.6

• Supports audio

• Generates up to 15s videos

• Works without extra limitations

• Ideal for higher-volume creation and testing