Michael Simard 71e70b77b0 Add matplotlib-based chart generation with Yahoo Finance data ...

- Add chart_generator.py with price and candlestick chart support
- Implement Yahoo Finance candle data fetching for free historical data
- Update bot to generate and attach charts to stock embeds
- Add matplotlib dependency to requirements.txt
- Configure dual API approach: Finnhub for quotes, Yahoo for charts

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

2025-12-25 00:25:00 -06:00

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