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feat: Add TuShare data collector (incremental update & resume support)

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## Description This PR introduces a new data collector for TuShare (daily frequency) under `qlib/scripts/data_collector/tushare/collector.py`. It provides a robust ETL pipeline similar to the Yahoo collector but tailored for TuShare's...

feat: add comprehensive short selling support to qlib backtest framework

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This commit introduces a complete short selling framework for qlib that enables: Core Components: - ShortableExchange: Exchange supporting short positions with proper fee calculation - ShortablePosition: Position class handling negative...