머니페니 9249821a25 feat: add realized/unrealized PnL tracking and position sizing guide
- Add realized_pnl column to transactions table with alembic migration
- Calculate realized PnL on sell transactions: (sell_price - avg_price) * quantity
- Show total realized/unrealized PnL in portfolio detail summary cards
- Show per-transaction realized PnL in transaction history table
- Add position sizing API endpoint (GET /portfolios/{id}/position-size)
- Show position sizing guide in signal execution modal for buy signals
- 8 new E2E tests, all 88 tests passing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-18 19:04:36 +09:00
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