Fix Issue 5: Create NFOServiceFactory for centralized initialization
- Created NFOServiceFactory in src/core/services/nfo_factory.py
- Enforces configuration precedence: explicit params > ENV > config.json
- Provides create() and create_optional() methods
- Singleton factory instance via get_nfo_factory()
- Updated 4 files to use factory (nfo.py, SeriesApp.py, series_manager_service.py, nfo_cli.py)
- Fixed test mocks: added ensure_folder_with_year(), corrected dependency test
- Tests: 17/18 NFO passing, 15/16 anime passing
- Resolves Code Duplication 2 (NFO initialization)
Lukas
fb8f0bdbd2