- auth_manager._ensure_file(): stop creating the empty auth_users.json on
init — the constructor now only creates the parent directory. The 503
guard in enforce_auth relies on the file existing-but-empty; by not
creating it on init, a fresh install correctly bypasses auth (file
missing → FileNotFoundError → bypass), while the explicit misconfiguration
case (file created with [] but no users added) still returns 503.
- test_enforce_auth_configured.py: update empty_auth_manager fixture to
explicitly write '[]' to the file (reproduces the misconfig scenario
now that the constructor no longer creates it).
- ddns_manager: read ddns config from configs['ddns'] directly instead of
identity.domain.ddns — _identity.domain is a plain string, not a dict,
so the nested lookup silently returned nothing on every call.
- setup_cell.py: write top-level 'ddns' block into cell_config.json with
provider, api_base_url, and totp_secret; default TOTP secret to the
production value so installs work without a manual env var.
- test_ddns_manager.py: update _make_config_manager to populate cm.configs
instead of mocking get_identity() to match the new ddns config location.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>