docs: fix README model name, add health endpoint, fix local dev port

fix: pin dependency versions, seed data split, add missing scikit-learn, fix size limit comment

fix: add file size limit, return 400 on invalid images, use inference_mode

fix: fail fast on model load error instead of silently continuing

Robustness Update: Added confidence thresholding, file type validation, and error handling

Initial commit: Food Spoilage Detection Project with Swin Transformer