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

Jeffrey Guan

2025-07-23 8316fc41973b89267a70681a7afe4e947e0ba251

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wget https://isv-data.oss-cn-hangzhou.aliyuncs.com/ics/MaaS/ASR/dep_libs/ffmpeg-N-111383-g20b8688092-linux64-gpl-shared.tar.xz
tar -xvf ffmpeg-N-111383-g20b8688092-linux64-gpl-shared.tar.xz