* fix ollama chat tool calling
handle dict arguments, streaming fallback, and message format
* pin setuptools<81 to ensure pkg_resources remains available
When ensure_torch_dependencies() installs torch/torchvision via pip, it can upgrade setuptools to >=81.0.0, which removed the pkg_resources module. rknn-toolkit2 depends on pkg_resources internally, so subsequent RKNN conversion fails with No module named 'pkg_resources'.
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