- Replace pgvector with Microsoft Vector DB for image vector storage and search
- Update Picture model to use float[] instead of Vector type
- Modify PictureService to use VectorDbService for vector search
- Remove vector-related code from MyDbContext
- Add PictureVector model for Vector DB integration
- Remove image format conversion and quality settings from the upload dialog
- Update backend to use default format and quality settings
- Add system configuration options for default image format and quality