fix: add @spaces.GPU decorator for ZeroGPU compatibility

app.py

@@ -660,8 +660,10 @@ load_models()
 # Flask directly via gunicorn. This block is kept for legacy compatibility.
 try:
     import gradio as gr
+    import spaces
     from fastapi.middleware.wsgi import WSGIMiddleware
 
+    @spaces.GPU
     def predict_gradio(statement, model_type):
         if not statement or len(statement) < 5:
             return "Please enter a statement with at least 5 characters."