Link dataset openbmb/UltraData-Math in Space metadata

Update README.md

fix: upgrade gradio to 5.9.1 to fix huggingface_hub compatibility

fix: quote python_version to prevent 3.10 -> 3.1 parsing

feat: hide model selector, add example buttons for one-click demo

fix: update README.md format to match Parser Space

fix: update sdk_version to 4.44.0

fix: use correct API endpoint and model (GLM_ar7snd)

Initial commit: UltraData-Math L3 Generator Space