Add Bunny CDN integration for video hosting

[madjin]

Summary

Implement Bunny CDN integration to replace/supplement YouTube for video hosting.

Implementation Status

• Created scripts/upload_to_cdn.py - Python script for Bunny CDN uploads
• Updated GitHub Actions workflow to upload to CDN
• Configure Bunny CDN secrets in GitHub repository
• Test full workflow with production credentials

New Scripts

• scripts/upload_to_cdn.py - Upload videos/metadata to Bunny CDN
• scripts/fetch_episodes.py - Fetch and sync episode list from Shmotime API

Environment Variables Needed

• BUNNY_STORAGE_ZONE - Storage zone name
• BUNNY_STORAGE_PASSWORD - Storage zone API password
• BUNNY_CDN_URL - CDN URL (optional, defaults to https://{zone}.b-cdn.net)

Usage

# Dry run upload
python scripts/upload_to_cdn.py --dry-run --file recordings/episode.mp4 --remote the-council/

# Upload directory
python scripts/upload_to_cdn.py --dir recordings/ --remote the-council/ --pattern "*.mp4"