fix(v0.11): 第二轮走查 P1/P2（按模块优先级）

- davinci：DavinciResult.fail/success；FileManager Feign Fallback 结构化降级；FileStorageManagerImpl 对空 Result/Response 防御
- cwos-resource：RestPortalUserServiceImpl 消除静默 null，统一 CloudwalkResult.fail 与 getDefaultPwd 空串语义
- device-manager：DeviceConstant 改为 final 工具类
- aks：AksRespCodeConstant final + 私有构造
- ninca-crk：启动入口 SLF4J、显式 Feign 扫描包、SpringApplication 写法
- ninca-qk-alarm：main 简化、收窄 @EnableFeignClients（保持 netflix 注解以兼容当前 BOM）

Made-with: Cursor

maven-ninca-crk/ninca-crk-gpu-std/src/main/java/cn/cloudwalk/Application.java

@@ -5,6 +5,8 @@ import com.github.pagehelper.autoconfigure.PageHelperAutoConfiguration;
 import io.micrometer.core.instrument.MeterRegistry;
 import io.micrometer.spring.autoconfigure.MeterRegistryCustomizer;
 import org.mybatis.spring.annotation.MapperScan;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.Banner;
 import org.springframework.boot.SpringApplication;
@@ -18,18 +20,21 @@ import org.springframework.scheduling.annotation.EnableAsync;
  * 轻舟标准 GPU 出入口聚合后端启动类。
  */
 @SpringBootApplication(exclude = {PageHelperAutoConfiguration.class})
-@EnableFeignClients
+@EnableFeignClients(basePackages = {"cn.cloudwalk"})
 @MapperScan({"cn.cloudwalk.data.**.mapper", "cn.cloudwalk.task.data.mapper"})
 @EnableAsync
 @EnableCloudwalkEvent
 @EnableAspectJAutoProxy(exposeProxy = true)
 public class Application {
+
+    private static final Logger log = LoggerFactory.getLogger(Application.class);
+
     public static void main(String[] args) {
-        System.out.println("[标准GPU服务器-出入口版]- 开始启动...");
-        SpringApplication app = new SpringApplication(new Object[] {Application.class});
+        log.info("[标准GPU服务器-出入口版] 开始启动…");
+        SpringApplication app = new SpringApplication(Application.class);
         app.setBannerMode(Banner.Mode.OFF);
         app.run(args);
-        System.out.println("[标准GPU服务器-出入口版]- 启动完成...");
+        log.info("[标准GPU服务器-出入口版] 启动完成（进程将持续运行直至关闭）");
     }
 
     @Bean