deploy bbuilder host

app.py

@@ -309,7 +309,37 @@ with gr.Blocks(title="bbuilder host") as demo:
         "This dashboard is read-only."
     )
 
-app = gr.mount_gradio_app(app, demo, path="/")
+def serve_via_gradio() -> None:
+    """Let Gradio own the server, then graft our API routes onto its FastAPI app.
+
+    ZeroGPU only notices @spaces.GPU functions when the app starts through
+    demo.launch(); calling uvicorn.run() on our own app bypasses that hook and the Space is
+    killed with "No @spaces.GPU function detected during startup". So Gradio launches, and
+    we insert our routes at the *front* of its router afterwards — position matters because
+    Gradio registers a catch-all for SPA routing that would otherwise shadow /health.
+    """
+    demo.queue()
+    demo.launch(
+        server_name="0.0.0.0",
+        server_port=int(os.environ.get("GRADIO_SERVER_PORT") or 7860),
+        prevent_thread_lock=True,
+        show_api=False,
+    )
+    target = demo.app
+    for route in reversed(app.router.routes):
+        if getattr(route, "path", None) in ("/openapi.json",):
+            continue
+        target.router.routes.insert(0, route)
+    print(f"[boot] grafted {len(app.router.routes)} API routes onto the Gradio app", flush=True)
+
+    while True:
+        time.sleep(3600)
+
+
+def serve_standalone() -> None:
+    """Local development: no ZeroGPU to appease, so run our own app directly."""
+    port = int(os.environ.get("GRADIO_SERVER_PORT") or os.environ.get("BB_PORT") or 7860)
+    uvicorn.run(gr.mount_gradio_app(app, demo, path="/"), host="0.0.0.0", port=port)
 
 
 if __name__ == "__main__":
@@ -317,8 +347,7 @@ if __name__ == "__main__":
     BOTS_DIR.mkdir(parents=True, exist_ok=True)
     threading.Thread(target=bootstrap, daemon=True).start()
     threading.Thread(target=self_ping, daemon=True).start()
-    # Gradio Spaces expose the app on GRADIO_SERVER_PORT (7860) and route the public domain
-    # there. Do NOT fall back to $PORT: HF sets it to something else in the container (7861,
-    # already bound), so trusting it makes the app fail to start with EADDRINUSE.
-    port = int(os.environ.get("GRADIO_SERVER_PORT") or 7860)
-    uvicorn.run(app, host="0.0.0.0", port=port)
+    if HAS_SPACES:
+        serve_via_gradio()
+    else:
+        serve_standalone()