媒体资料包自动制作

Please create a professional media kit for my YouTube channel:

1. Read my channel analytics from ~/youtube/analytics-export.csv
2. Read my brand assets from ~/brand/ folder
3. Create a media kit PDF that includes:
   - Channel overview and niche
   - Subscriber count and growth rate
   - Average views per video
   - Audience demographics (age, location, interests)
   - Top performing content examples
   - Previous brand collaborations (from ~/brand/past-sponsors.txt)
   - Sponsorship packages and pricing
   - Contact information

Export as a polished PDF to ~/media-kit/