Calculate portfolio risk metrics including VaR, CVaR, Sharpe, Sortino, and drawdown analysis. Use when measuring portfolio risk, implementing risk limits, or building risk monitoring systems.

计算投资组合风险指标，包括风险价值VaR、条件风险价值CVaR、夏普比率、索提诺比率和回撤分析。适用于衡量投资组合风险、设定风险限额或构建风险监控系统。