More accurate drawdown and performance history

We fixed a calculation issue that could hide intraday losses and understate a vault's maximum drawdown.

• Every equity interval is now included in the time-weighted return index, using a flow-neutral (Modified Dietz) adjustment for deposits and withdrawals.
• Detailed daily, weekly and monthly history is merged with lifetime history for a finer equity curve.
• All tracked vaults were recalculated — for example, Cold Process now shows its true historical drawdown of −13.8%.