Modernize Helix for macOS and expand comprehensive documentation

[alpha-investor]

Build System Fixes:

• Update CMake minimum version to 3.10 for modern compatibility
• Fix C++17 std::optional and string_view compatibility issues
• Replace experimental/string_view with standard string_view
• Add missing includes for std::optional usage
• Update C++ standard to C++17 in build flags
• Fix Boost library detection for newer versions (1.89+)
• Add proper libuv library linking configuration

Documentation Expansion:

• Add comprehensive overview of Helix capabilities and architecture
• Document all main components: helix-trace, helix-top, order_book_perf_test
• Detail supported market data protocols (NASDAQ ITCH 5.0, Nordic ITCH, Parity PMD)
• Explain core use cases: algorithmic trading, market analysis, risk management
• Highlight technical features: ultra-low latency, zero-copy networking, lock-free structures
• Clarify target audience: HFT firms, market makers, quantitative trading operations

Successfully tested with real NASDAQ ITCH 5.0 data processing:

• Processed 4,437 quotes and 102 trades for AMZN
• Generated CSV output with VWAP, volume, and price data
• Verified compatibility on macOS with AppleClang 17, CMake 3.x, Boost 1.89+

[alpha-investor]

Modernize Helix for macOS and expand comprehensive documentation