zephyrdark c1ee879cb4 feat: add backtest services (portfolio, engine, worker)
- VirtualPortfolio for portfolio simulation
- BacktestEngine for strategy backtesting
- Worker for async background execution

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2026-02-03 11:34:48 +09:00
..
2026-02-03 09:01:48 +09:00
2026-02-03 09:01:48 +09:00