fix(librechat): remove prompt=none for local dev compatibility

prompt=none causes silent failure when no Keycloak session exists yet.
Standard OIDC flow still provides seamless SSO when the user has an
active Keycloak session from the dashboard.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -70,7 +70,6 @@ services:
       OPENID_CALLBACK_URL: /oauth/openid/callback
       OPENID_SCOPE: openid profile email
       OPENID_BUTTON_LABEL: Login with CERTifAI
-      OPENID_AUTH_EXTRA_PARAMS: prompt=none
       # Disable local auth (SSO only)
       ALLOW_EMAIL_LOGIN: "false"
       ALLOW_REGISTRATION: "false"