a849a88fa3
- Update endpoint now returns CatalogReadDto or NotFound - Replace UpdateWithStoredProcedure with Upsert endpoint (PUT /upsert) - Rename AddAsync to InsertAsync; UpdateAsync returns DTO or null - Introduce UpsertAsync for combined insert/update logic - Remove stored procedure-specific update/delete methods - Use DTOs consistently in controller/service responses - Repository methods now return entities instead of booleans