zhoujie 800883b6ec Add data retrieval and processing scripts for futures data ...

- Implemented a function to fetch futures data from the API with error handling and response validation.
- Added example usage for fetching and saving K-line data to CSV.
- Updated CSV files with new data entries for specified date ranges.
- Enhanced the structure of the data retrieval function to include parameters for depth and adjust type.

2025-11-21 20:24:49 +08:00

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