docs: add comprehensive Cloudflare deployment guides

- CLOUDFLARE_IDEAL_SETUP.md: Complete architecture guide
- DEPLOYMENT_CHECKLIST.md: Step-by-step deployment (30 min)
- Includes troubleshooting, performance metrics, architecture diagrams

Perfect for getting production deployed with Cloudflare Workers,
Pages, KV storage, and Turso database.

🤖 Generated with Claude Code

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

Author: bhunt