Add Dockerfile to trigger Docker Space build

fix: revert to demo.app.mount

fix: mount gradio on fastapi directly

fix: use starlette middleware to intercept /backend/ requests before Gradio routing

add: httpx for async proxy

fix: use threading+httpx proxy instead of WSGIMiddleware mount

fix: mount flask app on /flask to avoid conflict with Gradio internal API

fix: pin fastapi and starlette for gradio 4.44.0 compatibility

fix: add @spaces.GPU decorator for ZeroGPU compatibility

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