debug: add traceback logging to identify gradcam error

fix: container startup - health endpoint returns immediately, add startup logs, optimize uvicorn for HF Spaces

perf: major build optimizations - remove matplotlib, fix duplicate endpoint, optimize dependencies

fixes to model building in huggingface

changes to gradcam

apidocs added

major fixes in app.py and inference.py accordingly for path issue

fixes to file name

changes to app.py path error fixes

adding first commit