forge: mount Gradio at /ui so it does not shadow /health and /v1

app.py

@@ -150,7 +150,8 @@ demo = gr.Interface(fn=chat,
                     title="Forge model server",
                     description="OpenAI-compatible endpoint at /v1/chat/completions")
 
-app = gr.mount_gradio_app(app, demo, path="/")
+# Gradio must NOT mount at "/": its catch-all shadows /health and /v1/*.
+app = gr.mount_gradio_app(app, demo, path="/ui")
 
 # NOTE: do NOT run uvicorn here. The HF Gradio runtime already binds PORT (7860);
 # launching our own server there fails with "address already in use". The mounted