Fix GB: select top-30 features in training order, fix sklearn version warning

Fix: use min-max normalization to match training (not /255)

Fix: cast np.str_ keys/label to str() for orjson serialization

Pin scikit-learn==1.6.1 to match training environment

Fix: add weights_only=True to all torch.load() calls

Update requirements.txt: PyTorch CNN + GB dual-model support

Update app.py: PyTorch CNN + GB dual-model support

Update requirements.txt: add CNN + GB dual-model support

Update app.py: add CNN + GB dual-model support

Upload requirements.txt with huggingface_hub

Upload app.py with huggingface_hub

initial commit