- Surface exact backend URLs as copyable text (Image 1 URL: https://...)
  alongside image blocks, and prompt now mandates verbatim copy
  (CRITICAL never-invent rule). Stops model hallucinating
  ai-image-output.maximo.ai/gen/... and breaking images.
- Endpoint-agnostic: echoes whatever URL backend returns, so both
  api.maximoai.co (/v1/api/image-generation) and
  api.mytabulon.com (/v1/image-generation) work, including multi-image
  and empty-result cases. No hardcoded domains in logic.