iA Writer's IndieAuth client predates PKCE support in the spec, so it
can't complete the normal authorization flow. Add an admin form to
mint a token directly (reusing the existing TokenService), so it can
be pasted into clients that support manual token setup instead.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017USyUg8PwuoDcHP8pv5xjy