41491da254
Add Authentication Provider section to /admin/settings for super users. Implements: provider ID, display name, issuer URL, internal base URL (optional, collapsed), client ID, client secret (masked, only sent on change), scopes fields; Test Connection button; Save and Reset to Environment Defaults with confirmation dialog; warning banner about service restart; env config info banner when no DB config is set. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>