Update api_server: add gemini 2.5 pro

pqai_agent_server/api_server.py

@@ -100,6 +100,7 @@ def list_models():
         "doubao-pro-32k": chat_service.VOLCENGINE_MODEL_DOUBAO_PRO_32K,
         "doubao-pro-1.5": chat_service.VOLCENGINE_MODEL_DOUBAO_PRO_1_5_32K,
         "doubao-1.5-vision-pro": chat_service.VOLCENGINE_MODEL_DOUBAO_1_5_VISION_PRO,
+        "openrouter-gemini-2.5-pro": chat_service.OPENROUTER_MODEL_GEMINI_2_5_PRO,
     }
     ret_data = [
         {