Complete Task 8: Database Support for NFO Status

- Added 5 NFO tracking fields to AnimeSeries model
- Fields: has_nfo, nfo_created_at, nfo_updated_at, tmdb_id, tvdb_id
- Added 3 service methods to AnimeService for NFO operations
- Methods: update_nfo_status, get_series_without_nfo, get_nfo_statistics
- SQLAlchemy auto-migration (no manual migration needed)
- Backward compatible with existing data
- 15 new tests added (19/19 passing)
- Tests: database models, service methods, integration queries

docs/task5_status.md

@@ -72,8 +72,9 @@ Task 5 is fully complete with all endpoints, models, tests, and documentation im
 6. ✅ FastAPI integration complete
 
 **Time Investment:**
-- Estimated: 3-4 hours
-- Actual: ~3 hours
+
+-   Estimated: 3-4 hours
+-   Actual: ~3 hours
 
 ## 🎯 Acceptance Criteria Status