修正日志信息中的区域标识符，从 key 更改为 code，以提高设备信息查询的准确性

src/agent/tool_monitor.py

@@ -100,7 +100,7 @@ class MonitorPointTool(BaseTool):
             return self._get_points_info(code, year, disaster_type, three_d_model, ortho_image, disaster_threat_people_range_start, disaster_threat_people_range_end, disaster_scale_start, disaster_scale_end, warn_level, device_type)
 
     def _get_device_info(self, code: str, start_time: str = "", end_time: str = "", device_type: str = ""):
-        self.logger.info(f"开始查询设备信息，区域: {key}")
+        self.logger.info(f"开始查询设备信息，区域: {code}")
 
         try:
             response = self.client.query_device_and_sensor(code, start_time, end_time, device_type)