[CL-009] feat: Implement imaging module for radiology studies
Add complete imaging module with:
- Entities: ImagingStudy (catalog), ImagingOrder (workflow), DicomInstance (DICOM tracking)
- Services: Study management, Order workflow (ordered->scheduled->performed->reported), DICOM file management
- Controller: REST endpoints for studies, orders, and DICOM instances
- Features: Multi-tenant support, study types (xray, ct, mri, ultrasound, mammography, pet, nuclear),
order scheduling, radiologist assignment, critical findings flagging, DICOM viewer URLs
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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