docs: update model card with 4-way defect classifier and anti-gaming repair verification details

Update README with multi-class defect classification details and usage

Add minified multi-class road defect model for browser inference

Add multi-class road defect classification model (trained_forest.json)

docs: add comprehensive model card

docs: add PR_curve.png

docs: add F1_curve.png

docs: add results.png

docs: add confusion_matrix.png

Upload README.md with huggingface_hub

Upload best.pt with huggingface_hub

initial commit