- Add vulnerability snapshot DTO, handler, repository, and service layer with comprehensive test coverage
- Add screenshot snapshot DTO, handler, repository, and service layer for snapshot management
- Reorganize directories tab from secondary assets navigation to primary navigation in scan history and target layouts
- Update frontend navigation to include FolderSearch icon for directories tab with badge count display
- Add i18n translations for directories tab in English and Chinese messages
- Implement seed data generation tools with Python API client for testing and data population
- Add data generator, error handler, and progress tracking utilities for seed API
- Update target validator to support new snapshot-related validations
- Refactor organization and vulnerability handlers to support snapshot operations
- Add integration tests and property-based tests for vulnerability snapshot functionality
- Update Go module dependencies to support new snapshot features
