fix: Add retry logic for AkShare to maximize data completeness (turnover rate)

fix: Correct REITs interface, Yahoo Finance suffixes, and sync limit logic

fix: Update sync script with latest AkShare interfaces and North Exchange support

feat: Finalize sync logic with full-market support and robust incremental updates

fix: Prioritize existing stocks in sync to ensure continuous incremental updates

fix: Add database fallback for target list fetching to support offline sync in HF

fix: Set scheduler timezone to Asia/Shanghai for accurate daily sync

fix: Improve stability with cache invalidation and robust DB connection management

feat: Add APScheduler for automatic daily incremental sync at 17:30

feat: Expand sync to 10 years and add Convertible Bonds and REITs support

feat: Implement incremental sync for stocks, funds, and time

fix: Scalar subquery error in kline data fetching

perf: Optimize database queries and reduce latency for game start

perf: Add memory cache for eligible stocks to speed up game start

feat: Add Yahoo Finance as fallback data source for overseas environments

fix: Add retry logic and alternative interface for stock list fetching

feat: Implement background sync task in API

fix: Align DUCKDB_PATH with Dockerfile

feat: Improve return rate chart with 0-axis emphasis and percentage formatting

feat: Complete stock trading simulation system