a51184497d
- Add cross-sectional strategy type (single vs cross-sectional) - Support multi-symbol portfolio management with automatic ranking - Add portfolio size, long ratio, and rebalance frequency configuration - Implement parallel order execution for cross-sectional strategies - Add frontend UI for strategy type selection and configuration - Add i18n support (Chinese and English) for cross-sectional features - Fix decimal precision issues in exchange order quantities - Add last_rebalance_at field to database schema - Add comprehensive documentation and examples Database migration required: Add last_rebalance_at column to qd_strategies_trading table