Mount FastAPI backend routes at router head for direct REST API access

app.py

@@ -60,11 +60,12 @@ with gr.Blocks(title="🌾 CropAI Agronomic Cloud") as demo:
     * **Drone VRA:** Autonomous Spot-Spraying Lawnmower Grid Generator
     """)
 
-# Attach all FastAPI backend routes onto Gradio's internal FastAPI app
-existing_paths = {getattr(r, 'path', '') for r in demo.app.routes}
-for route in backend_app.routes:
-    if getattr(route, 'path', '') not in existing_paths:
-        demo.app.routes.append(route)
+# Attach all FastAPI backend routes to the FRONT of Gradio's router
+# This ensures REST API endpoints (/api/v1/..., /health, /docs) take precedence
+# over Gradio's catch-all SPA route, while the root '/' serves the Gradio UI.
+backend_routes = [r for r in backend_app.routes]
+gradio_routes = [r for r in demo.app.router.routes if getattr(r, 'path', '') not in {getattr(br, 'path', '') for br in backend_routes}]
+demo.app.router.routes = backend_routes + gradio_routes
 
 if __name__ == "__main__":
     demo.launch()