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

Former-commit-id: 470103bfdd

maven-ninca-qk-alarm/ninca-qk-alarm-app-starter/src/main/java/cn/cloudwalk/AlarmApplication.java

@@ -11,13 +11,12 @@ import org.springframework.scheduling.annotation.EnableScheduling;
  * 区域告警应用入口：启用 Feign、服务发现、调度与 MyBatis 扫描。
  */
 @MapperScan({"cn.cloudwalk.data.alarm.**.mapper"})
-@EnableFeignClients(basePackages = {"cn.cloudwalk"})
+@EnableFeignClients(basePackages = {"cn.cloudwalk.data.alarm", "cn.cloudwalk.ninca"})
 @EnableDiscoveryClient
 @SpringBootApplication
 @EnableScheduling
 public class AlarmApplication {
     public static void main(String[] args) {
-        SpringApplication application = new SpringApplication(new Object[] {cn.cloudwalk.AlarmApplication.class});
-        application.run(args);
+        SpringApplication.run(AlarmApplication.class, args);
     }
 }