Apply the same interactive model picker UI to the image model field.
Since Cloudflare models don't come from OpenRouter's registry, the
two FLUX models are embedded as static data in the page config and
the JS popup renders cost-per-image instead of token pricing.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Extract schedule, publishing, analytics, and images field definitions
into PRAutoBlogger_Settings_Fields_Extended. Core class retains sections
and API/Models/Content/Sources fields, merging extended fields via
get_fields(). Both files well under 300-line limit.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>