fix: pin numpy to 1.26.4 — numpy 2.x breaks torchvision 0.17.2 ToTensor

fix: catch all inference exceptions and OSError in SSRF check to surface real 500 cause

fix: read CORS allowed origins from ALLOWED_ORIGINS env secret

feat: add Dockerfile and HF Spaces config for deployment

feat: integrate real SensiNet mammography model

feat: bootstrap mammogram inference API starter