refactor: remove dead ZeroGPU shim (Docker Spaces don't support ZeroGPU)

docs: add HF Space badge + MIT LICENSE file

chore(hf): add Hugging Face Space metadata frontmatter to README

feat(scripts): start.ps1 offers winget install of Python 3.11 + Node LTS; start.sh hints brew/apt

docs: README with quick start, deploy notes, model table

Initial commit