Fam Zheng 7939990181 patch: CN mirrors for pytorch-wheels and HF datasets ...

- pyproject.toml + uv.lock: pytorch-cu128/cpu indexes → mirror.sjtu.edu.cn
  (aliyun lacks 2.9.1, sjtu has it)
- nanochat/dataset.py: climbmix BASE_URL → hf-mirror.com

For ailab (CN, RTX 5090) where direct pytorch.org and huggingface.co
are unreachable. Override at uv-sync time with UV_DEFAULT_INDEX env.

2026-05-05 22:21:21 +01:00

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