docs: add CLAUDE.md and backtest visualization workflow example

[chenminghui1]

Summary

• Add CLAUDE.md with project architecture overview, build/test/lint commands, and config-driven design patterns for Claude Code
• Add examples/my_workflow_with_visual.py — a complete training + backtest + visualization script based on LightGBM Alpha360 config, generating 4 types of charts: report overview, IC analysis, risk analysis, and cumulative return decomposition

Test plan

• File CLAUDE.md renders correctly with valid markdown
• examples/my_workflow_with_visual.py follows the same config pattern as existing benchmarks
• All referenced modules and imports exist in the codebase

🤖 Generated with Claude Code

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