Replace \"深度推理(上海)科技有限公司\" with \"字节跳动子公司\"
as the case study example to avoid exposing user's own company info.
Also update .gitignore to exclude:
- deep-research-output/ (contains sensitive research data)
- recovered_deep_research/
- .opencli/
- douban-skill/ (work-in-progress)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>