a56204a5f2
All settings (auth credentials, scanner ranges, status_checker interval) now live in a single .env file via pydantic-settings. config.yml and config.yml.example are deleted. - Settings: add auth_username, auth_password_hash, scanner_ranges, status_checker_interval; add load_overrides()/save_overrides() for persisting runtime changes to data/scan_config.json - auth.py: read credentials directly from settings - scan.py: read ranges/interval from settings; write-back via save_overrides() - scheduler.py: read interval directly from settings - main.py: call settings.load_overrides() at startup - docker-compose.yml: remove config.yml volume mount, add new env vars - conftest.py: set settings fields directly instead of writing a temp config.yml