Add unit tests for /api/v1/status endpoint focusing on OIDC config:
- Test hybrid mode (multi_user_basic + enable_offline_access) returns OIDC
- Test pure multi_user_basic mode without offline_access omits OIDC
- Test OAuth mode returns OIDC config
- Test single-user BasicAuth mode omits OIDC config
- Test partial OIDC config (only discovery_url or only issuer)
Also updates docs/authentication.md with Astrolabe hybrid mode setup:
- Two-step credential setup (OAuth + app password)
- Technical details for each credential type
- Request direction table explaining why two credentials needed
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Chris Coutinho