Furniture material swap: wood to brushed metal

Demonstrates the material replacement capability of the fibo-edit-1.5 image editing pipeline: the furniture's form, joinery structure, and shooting angle in the original image are preserved, while only the wooden surface is changed to brushed metal, to observe whether the model remains stable without drift under a single-attribute change. In practice, "change only the material, not the composition or light direction" is written into the instruction, and the result is reproduced deterministically with a fixed seed; the reference image is generated by the pipeline and serves as the sole input to image_urls. Applicable scenarios: material-swap previews for furniture e-commerce, comparison of material options, and batch restyling of product images.