deps: add torch/torchvision/pillow for MRI DL 2D

Add project files

feat(rag): add fastembed/faiss-cpu/pypdf for retrieval layer

feat(llm): explainer with deterministic template + OpenRouter fallback

feat(models): BBB classifier with predict_with_proba uncertainty

feat(frontend): Streamlit dashboard with 3 modality tabs

fix(mri): pin ComBat transitive deps; clarify np.round(14) intent; guard inputs

feat(bbb): switch processed output to Parquet for dtype preservation

chore: lock Python to 3.10–3.12 to match cp312-capped wheel availability

chore: pin runtime + dev dependencies for all three modalities