Replace request.url with WEBAPP_URL from @calcom/lib/constants as the base URL
for NextResponse.redirect() in booking confirmation API routes. Behind a reverse
proxy, request.url resolves to http://localhost:3000 instead of the public domain.
Fixes#20358
Co-Authored-By: unknown <>
Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>