Add integrated DFU dashboard + Fitzpatrick adjustment (English UI)

feat: lighting quality assessment for Fitzpatrick estimation

feat: PDF report + guided camera capture with foot silhouette

feat: add downloadable clinical report (PNG 300 DPI + JSON)

feat: upgrade pipeline UI — binary seg + multiclass + PWAT raw vs adjusted

Fix: lazy loading, disable TTA on CPU, error handling, remove double inference

Add pipeline code, PWAT models, and Gradio app