docs(readme): update onnx example import path and cache location (#2607)

Jeffrey Guan

2025-07-23 8316fc41973b89267a70681a7afe4e947e0ba251

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repos:
  - repo: https://github.com/psf/black
    rev: 24.4.0
    hooks:
      - id: black
        args: ['--line-length=100']  # 示例参数，black默认使用4个空格缩进