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feat(readme): add instructions for config file setup and model weight path configurationUpdate the README_zh-CN.md to include detailed steps for copying the
configuration template to the user directory and configuring the 'models-dir'
to point to the downloaded model weight files. This ensures users have a clear
guideline on setting up the configuration file correctly, preventing program
failures due to missing model files.

文末增加友情链接，便于给labelllm\labelu仓库引流

add demo video