fix: add @spaces.GPU decorator for Zero GPU environment

app.py

@@ -11,18 +11,22 @@ DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
 # --- Basic Agent Definition ---
 # ----- THIS IS WERE YOU CAN BUILD WHAT YOU WANT ------
 from smolagents import CodeAgent, LiteLLMModel, DuckDuckGoSearchTool
+import os
+import spaces  # 💡 1. 引入 Hugging Face 的 GPU 空間套件
 
 class BasicAgent:
-    def __init__(self):        
+    def __init__(self):
         hf_token = os.getenv("HF_TOKEN")
         
         self.model = LiteLLMModel(
             model_id="huggingface/Qwen/Qwen2.5-72B-Instruct",
-            token=hf_token  # 帶入讀取到的變數
+            token=hf_token
         )
         self.search_tool = DuckDuckGoSearchTool()
         self.agent = CodeAgent(tools=[self.search_tool], model=self.model)
 
+    # 💡 2. 在實際執行的函式上方加上這個裝飾器，滿足 Zero GPU 的啟動檢查
+    @spaces.GPU
     def __call__(self, question: str) -> str:
         try:
             return str(self.agent.run(question))