Revert model inference API switch; restore krea/Krea-2 Space call

Override call_model to forward Krea 2 params to Inference API in app.py

Revert model inference API switch; restore krea/Krea-2 Space call

Require HF login for Krea generation; show friendly auth error in app.py

Surface diagnostic detail on Krea model-call failures in app.py

Override call_model to forward Krea 2 params to Inference API in app.py

Add fallback default parameter values to app.py

Implement Krea-2 Gradio Workflow Space App