drop PyTorch CPU index URL and loosen torch pins for Python 3.14

Streamlit Cloud runs Python 3.14 regardless of runtime.txt, and the
PyTorch CPU index (download.pytorch.org/whl/cpu) returns 403 on their
servers. PyPI only carries torch>=2.9 for Python 3.14, so pinning
torch==2.6.0+cpu was guaranteed to fail.

Remove the --extra-index-url entirely and let pip resolve torch and
torchvision freely from PyPI. Loosen streamlit to >=1.35 so the same
constraint applies on whatever Python Streamlit Cloud happens to deploy.

Author: wa5rx3

requirements.txt

@@ -1,10 +1,9 @@
-# Streamlit Cloud deployment — CPU-only PyTorch
+# Streamlit Cloud deployment — CPU-only PyTorch (Python 3.14 compatible)
 # Only direct dependencies are pinned; transitive deps resolve automatically.
 # For full local reproducibility with GPU use requirements_dev.txt
---extra-index-url https://download.pytorch.org/whl/cpu
-streamlit==1.55.0
-torch==2.6.0+cpu
-torchvision==0.21.0+cpu
+streamlit>=1.35
+torch>=2.0
+torchvision>=0.15
 numpy>=1.26,<3
 pandas>=2.0
 pillow>=10.0