Update app.py

Update app.py

fix: add @spaces.GPU decorator to preprocess for ZeroGPU compatibility

feat: add clear button, SSE progress tracking, multi-session support

UI updates: Pixal3D V1.1 branding, camera settings, readme, ref thumbnail, GPU duration 240s, fix EXR path

gradio server (#3)

Update title, add project page link, add autotune cache

Add ZeroGPU support: import spaces first, add @spaces.GPU decorators, add flex_gemm env vars

Update app.py

Update app.py

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