fix: choose writable cache root at space startup

fix: use writable runtime dirs in training space

fix: patch torchao dtype imports for unsloth

fix: shim torch._pytree.register_constant for torchao compat

fix: use PyTorch nightly for torchao compat

fix: switch to cu124 wheel index for torch 2.6.0

fix: pin torch==2.6.0 to satisfy torchao torch.int1 requirement

fix: add unsloth_zoo as explicit dependency before unsloth

fix: install unsloth in Docker image at build time

feat: add A100 training Space with manual-trigger Gradio UI