Fix: .then() chaining for instant status, remove gr.File, robust error return

Fix: remove gr.File output (triggers Gradio 5.20 API schema bug)

Fix: remove gr.Progress (breaks API schema in Gradio 5.20, kills all inference)

Fix status updates: use gr.Progress instead of yield generator

Fix streaming: split into outer generator + inner @spaces.GPU function

Add live status updates: GPU allocated / generating / done

Fix: switch to PaintByExamplePipeline (CatVTON had no model_index.json)

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