longbridge-risk-return Risk-return optimisation — evaluate portfolio efficiency versus the efficient frontier and recommend optimal asset allocation. Response language : match the user's input language — Simplified Chinese / Traditional Chinese / English. When to use Trigger on prompts asking for: - Portfolio optimisation — "帮我优化投资组合" , "optimal portfolio" , "投资组合优化" - Efficient frontier analysis — "有效前沿" , "efficient frontier" , "组合效率" - Risk preference-based allocation — "稳健型配置" , "aggressive allocation" , "风险偏好配置" - Risk-adjusted return improvement — "提高夏普比率" , "risk-adjusted return" , "大类…