Model card: remove the model-downloads chart

VTM-1.5.1: 1-step SFT distill (CFG baked in) + Ultra fast decoder + 60 fps demo

Card: get VTM Spark from vtmstudio.dev/download

VTM-1.5.1.pt = the release checkpoint (10-step teacher, 1 or 2 steps); card: how it works, download chart, commercial-use column, license: other

Point the card at the renamed repo sinBoo1/VTM-Spark

Update model card: VTM-1.5.1, VTM Spark, demo, files and licences

Remove method illustration and caption

Simplify card: torso limits, shorter architecture, new illustration

Revise model card: architecture, 7 FPS note, method figure

Expand model card: VTuber pose-transfer beta docs

Update README.md

initial commit