- Create ScholarlyOpinion model for standalone reusable scholarly opinions with status and multilingual text
- Add foreign key link from TransmitterOpinion to ScholarlyOpinion with automatic backward sync
- Create data migration 0053 to populate ScholarlyOpinion records from existing transmitter opinions
- Expose DovodiScholarlyOpinionViewSet and register route /dovodi-opinions/ in admin router
- Update TransmitterOpinion serializers and views to prioritize linked ScholarlyOpinion data