- Create DataMigrationService for migrating data files to SQLite
- Add sync database methods to AnimeSeriesService
- Update SerieScanner to save to database with file fallback
- Update anime API endpoints to use database with fallback
- Add delete endpoint for anime series
- Add automatic migration on startup in fastapi_app.py lifespan
- Add 28 unit tests for migration service
- Add 14 integration tests for migration flow
- Update infrastructure.md and database README docs
Migration runs automatically on startup, legacy data files preserved.
