Update README to accurately reflect OJOS AI 5-disease model and features

Remove unused single-disease cataract model file to avoid confusion

Convert emails to lowercase during auth to resolve case-sensitivity issues

Configure database path to /tmp/users.db on Linux to support write operations in Hugging Face read-only containers

Replace obsolete libgl1-mesa-glx with libgl1 in Dockerfile

Remove tensorflow-cpu version pinning to resolve HF build failure

Initial commit for OJOS AI: Multiclass model integration, Keras 3 compatibility patch, and glassmorphism styling