Merge remote-tracking branch 'origin/main'

Update model card: document both alphanumeric and alphabet models with real metrics

Upload alphabet ONNX model (27-class: A-Z + blank)

Upload alphanumeric ONNX model (37-class: digits + A-Z + blank)

Add alphabet-only model (27-class) alongside alphanumeric (37-class)

Update model card with correct 37-class training results

Update model card with training results

Update README.md

Upload folder using huggingface_hub

Upload alphabet_model.onnx with huggingface_hub

Update model card for 37-class alphanumeric model

Upload alphabet_model.onnx with huggingface_hub

Add model card

Upload folder using huggingface_hub

Upload alphabet_model.onnx with huggingface_hub

initial commit