Add day1_comparative_analysis: Multi-strategy scraping with async batch processing

This notebook extends Day 1 with production-ready web scraping techniques:
- Multi-strategy fetcher: tries simple requests first, falls back to Playwright
- Async batch processing: analyze multiple URLs concurrently
- Comparative analysis: use GPT to compare insights across websites
- Educational content: explains SSR vs CSR, modern web architecture

Key features:
• Smart detection for when JavaScript rendering is needed
• Handles bot protection and timeout issues
• Real-world examples (news sites, AI companies)
• Business applications: competitive analysis, market research

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: ubo32