zephyrdark 89bd8fea53 feat: add scheduler, returns calculator, and history page
- APScheduler for daily snapshots (18:30 weekdays)
- ReturnsCalculator with CAGR, TWR, MDD, volatility
- Portfolio history page with snapshots and returns tabs
- FastAPI lifespan integration for scheduler

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2026-02-03 12:26:16 +09:00
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