Move field-extraction inside the try/except in fetch_user so non-dict
responses from providers with empty profile_data_path (Gitea, GitHub)
raise OAuthError instead of an uncaught AttributeError. Apply
html.escape() to provider name, label, and logo URL in the login page.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Add hbd/server/oauth.py with OAuthError, _gitea_cfg(), and is_enabled()
to detect when all three required Gitea OAuth2 config keys are present.
Add "oauth": {} default to SERVER_DEFAULTS in config.py.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>