Add stock prediction experiments: AAPL forecast + 4-version backtest comparison

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- stock_forecast.py: Basic AAPL price forecast
- stock_backtest.py: V1 original price prediction backtest
- stock_backtest_optimized.py: V2 log-return + ensemble optimization
- stock_backtest_xreg.py: V3 XReg covariates (volume/RSI/SPY)
- stock_backtest_trick.py: V4 SPY trend guidance + volatility adjustment
- Visualization charts for all versions

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freedakgmail

2026-07-01 21:01:59 +08:00

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