Default to http:// for URLs without a scheme in ocurl
When users provide a URL like "anil.recoil.org" without a scheme,
normalize it to "http://anil.recoil.org" to avoid invalid redirect
URLs being formed (e.g., "///anil.recoil.org").
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>