Add comprehensive CFOST infrastructure guide

Create detailed technical documentation covering:
- Problem space and real-world scenarios
- Core philosophy and design principles
- Complete technical architecture breakdown
- CRDT theory and implementation details
- P2P networking with libp2p
- Security model and cryptographic primitives
- Use cases across 6 different domains
- End-to-end synchronization flow
- Comparison with competing solutions
- Advanced topics (GC, schema evolution, performance)

This 700+ line guide provides developers with everything needed
to understand CFOST's architecture, capabilities, and usage.

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

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

Author: Ru1vly