Release v0.2.0 - Add time series forecasting service

[zhongyu09]

Time Series Forecasting: Integrated Transformer-based forecasting service with Docker deployment

• New timeseries_forecast tool for OpenChatBI agent
• A new FastAPI based forecasting service supporting time series predictions
• Automatic GPU detection and health monitoring
• See timeseries_forecasting/README.md for setup guide

Full Changelog: v0.1.1...v0.2.0

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