sentienl gateway 标识去除，spring-cloud-alibaba-sentinel-gateway 会默认标识

yudao-gateway/src/main/java/cn/iocoder/yudao/gateway/GatewayServerApplication.java

@@ -7,7 +7,6 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 public class GatewayServerApplication {
 
     public static void main(String[] args) {
-        System.setProperty("csp.sentinel.app.type", "1");
         // 启动 Spring Boot 应用
         SpringApplication.run(GatewayServerApplication.class, args);
     }

yudao-module-infra/yudao-module-infra-biz/src/main/java/cn/iocoder/yudao/module/infra/controller/admin/demo/sentinel/SentinelDemoController.java

@@ -13,6 +13,10 @@ import javax.annotation.security.PermitAll;
 import javax.servlet.http.HttpServletRequest;
 import java.util.UUID;
 
+/**
+ * sentinel 示例
+ * TODO 芋艿：考虑后续优化示例
+ */
 @Tag(name = "管理后台 - sentinel")
 @RestController
 @RequestMapping("/infra/sentinel/demo")