feat: support dynamic max_steps via environment variable

app.py

@@ -21,7 +21,11 @@ def fake_gpu_function():
 class BasicAgent:
     def __init__(self):
         self.openrouter_key = os.getenv("OPENROUTER_API_KEY")
-        self.model_id = os.getenv("HF_MODEL_ID", "google/gemini-2.5-flash")
+        # 確保模型 ID 乾淨，避免 400 錯誤
+        self.model_id = "google/gemini-2.5-flash"
+        
+        # 💡 從環境變數讀取 max_steps，如果沒設定，預設為 smolagents 原廠的 12 輪
+        self.max_steps = int(os.getenv("MAX_STEPS", "12"))
 
     def __call__(self, question: str) -> str:
         try:
@@ -38,7 +42,7 @@ class BasicAgent:
             agent = CodeAgent(
                 tools=tools, 
                 model=model, 
-                max_steps=6
+                max_steps=self.max_steps  # 💡 帶入變數
             )
             
             return str(agent.run(question))