When format=jpg/jpeg and save=true, the chart is now saved to both:
- SavePath/{isin}.jpg (visible filename)
- SavePathEnc/{alias}.jpg (encoded filename, if alias exists)
This allows the external script to call the API once instead of twice
(no more separate jpg + jpgEnc calls). format=jpgEnc remains unchanged
for backward compatibility.
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>