Update agent.py

agent.py

@@ -107,6 +107,7 @@ class LangGraphAgent:
             os.getenv("OPENROUTER_API_KEY"),
             os.getenv("OPENROUTER_API_KEY_1"),
             os.getenv("OPENROUTER_API_KEY_2"),
+            os.getenv("OPENROUTER_API_KEY_3")
         ]
         self.key_index = 0
         print("LangGraphAgent initialized.")