Update response formats for /colorize and /health endpoints - /colorize: Add filename, caption, change to PNG format, api_download_url - /health: Add model_type and provider fields
Make CCO model default for colorization - Change default model from GAN (dummy) to CCO (working) - Add fallback to GAN if CCO not available - Fix image format and saving issues
Integrate CCO colorization models (eccv16 and siggraph17) - Add CCO colorizers module from kinsung/cco - Update /colorize endpoint to support model selection parameter - Add scikit-image dependency - Maintain backward compatibility with existing GAN model - Update MongoDB logging to track model type used