머니페니 f818bd3290 feat: add walk-forward analysis for backtests
- Add WalkForwardResult model with train/test window metrics
- Create WalkForwardEngine that reuses existing BacktestEngine
  with rolling train/test window splits
- Add POST/GET /api/backtest/{id}/walkforward endpoints
- Add Walk-forward tab to backtest detail page with parameter
  controls, cumulative return chart, and window results table
- Add Alembic migration for walkforward_results table
- Add 8 unit tests for window generation logic (100 total passed)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-18 22:33:41 +09:00
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