When OIDC is configured, admins can now enable 'Disable password
authentication' in Admin → Settings → SSO. This blocks all password-
based login and registration, forcing users through the SSO identity
provider instead.
Backend:
- routes/admin.ts: expose oidc_only flag on GET /admin/oidc and accept
it on PUT /admin/oidc (persisted to app_settings)
- routes/auth.ts: add isOidcOnlyMode() helper; block POST /auth/login,
POST /auth/register (for non-first-user), and PUT /auth/me/password
with HTTP 403 when OIDC-only mode is active
- routes/auth.ts: expose oidc_only_mode boolean in GET /auth/app-config
Frontend:
- AdminPage: toggle in OIDC/SSO settings section (oidc_only saved with
rest of OIDC config on same Save button)
- LoginPage: when oidc_only_mode is active, replace form with a
single-button OIDC redirect; hide register toggle
- SettingsPage: hide password change section when oidc_only_mode is on
- i18n (en/de): admin.oidcOnlyMode, admin.oidcOnlyModeHint,
login.oidcOnly
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