完善开源发布配置和使用文档

start.py

@@ -7,9 +7,10 @@ from controller.logger import logger
 
 if __name__ == '__main__':
 
-    host = os.getenv('HOST', "192.168.1.100")
-    username = os.getenv('USERNAME', "root")
-    password = os.getenv('PASSWORD', "your_idrac_password")
+    # 从环境变量读取iDRAC连接信息，开源版本不内置任何真实默认凭据
+    host = os.getenv('HOST')
+    username = os.getenv('USERNAME')
+    password = os.getenv('PASSWORD')
     if not host:
         raise RuntimeError('未设置 HOST 环境变量')
 
@@ -19,14 +20,17 @@ if __name__ == '__main__':
     if not password:
         raise RuntimeError('未设置 PASSWORD 环境变量')
 
+    # 复用控制器实例，避免每轮循环丢失上次设置状态
     client = FanController(host=host, username=username, password=password)
 
     while True:
         try:            
+            # 执行一次温度读取和风扇控制周期
             client.run()
             time.sleep(60)
         except Exception as err:
             logger.error(
                 f'运行控制器失败 {err}. {traceback.format_exc()}'
             )
+            # iDRAC会话异常时等待下一轮，避免连续请求压垮IPMI服务
             time.sleep(60)