Cloudflare Workers AI changed the API for flux-2-dev, flux-2-klein-4b,
and flux-2-klein-9b to require multipart/form-data (instead of JSON) and
now returns {"image":"<base64>"} instead of raw PNG bytes.
- Add requiresMultipart() helper for the three FLUX.2 models
- callImageAPI builds multipart body for those models, JSON for others
- Parse {"image":"<base64>"} JSON response; fall back to raw bytes for legacy models
- Use "steps" field name (not "num_steps") in multipart forms per CF docs
- Book page: capture and display actual backend error message instead of blank 'Error'