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-cloudwalk-intelligent-davinci-manager/davinci-manager-storage/src/main/java/cn/cloudwalk/intelligent/davinci/storage/feign/FileManagerFeign.java

@@ -2,7 +2,10 @@ package cn.cloudwalk.intelligent.davinci.storage.feign;
 
 import cn.cloudwalk.intelligent.davinci.common.result.DavinciResult;
 import cn.cloudwalk.intelligent.davinci.storage.bean.file.dto.FileRemoveDTO;
+import feign.Request;
 import feign.Response;
+import java.nio.charset.StandardCharsets;
+import java.util.Collections;
 import java.util.List;
 import org.springframework.stereotype.Component;
 import org.springframework.web.bind.annotation.PathVariable;
@@ -43,39 +46,46 @@ public interface FileManagerFeign {
     @Component
     class FileManagerFeignClientFallback implements FileManagerFeign {
 
+        private static final String FEIGN_DOWN = "DAVINCI_FEIGN_DOWN";
+
         @Override
         public DavinciResult<String> fileUpload(MultipartFile file) {
-            throw new RuntimeException("调用Davinci-portal服务，模块文件上传接口异常");
+            return DavinciResult.fail(FEIGN_DOWN, "调用Davinci-portal服务，模块文件上传接口降级");
         }
 
         @Override
         public DavinciResult<String> fileUpload(String moduleCategory, MultipartFile file) {
-            throw new RuntimeException("调用Davinci-portal服务，模块文件上传接口异常");
+            return DavinciResult.fail(FEIGN_DOWN, "调用Davinci-portal服务，模块文件上传接口降级");
         }
 
         @Override
         public DavinciResult<String> bigFileUpload(MultipartFile file) {
-            throw new RuntimeException("调用Davinci-portal服务，大文件上传接口异常");
+            return DavinciResult.fail(FEIGN_DOWN, "调用Davinci-portal服务，大文件上传接口降级");
         }
 
         @Override
         public DavinciResult<String> bigFileUpload(String moduleCategory, MultipartFile file) {
-            throw new RuntimeException("调用Davinci-portal服务，大文件上传接口异常");
+            return DavinciResult.fail(FEIGN_DOWN, "调用Davinci-portal服务，大文件上传接口降级");
         }
 
         @Override
         public Response fileDownload(String path) {
-            throw new RuntimeException("调用Davinci-portal服务，获取文件流接口异常");
+            return Response.builder()
+                .status(503)
+                .reason("Feign fallback")
+                .request(Request.create(Request.HttpMethod.GET, "/", Collections.emptyMap(), null, StandardCharsets.UTF_8))
+                .body("{}", StandardCharsets.UTF_8)
+                .build();
         }
 
         @Override
         public DavinciResult<String> getFileData(String path) {
-            throw new RuntimeException("调用Davinci-portal服务，获取获取文件Base64内容接口异常");
+            return DavinciResult.fail(FEIGN_DOWN, "调用Davinci-portal服务，获取文件Base64内容接口降级");
         }
 
         @Override
         public DavinciResult<List<String>> remove(FileRemoveDTO dto) {
-            throw new RuntimeException("调用Davinci-portal服务，删除文件接口异常");
+            return DavinciResult.fail(FEIGN_DOWN, "调用Davinci-portal服务，删除文件接口降级");
         }
     }
 }

maven-cloudwalk-intelligent-davinci-manager/davinci-manager-storage/src/main/java/cn/cloudwalk/intelligent/davinci/storage/manager/impl/FileStorageManagerImpl.java

@@ -107,6 +107,12 @@ public class FileStorageManagerImpl implements FileStorageManager {
         }
     }
 
+    private static void requireDavinciResult(DavinciResult<?> result, String op) throws DavinciServiceException {
+        if (result == null) {
+            throw new DavinciServiceException("NULL_RESULT", "Davinci-portal 返回空结果: " + op);
+        }
+    }
+
     private static InputStream attachResponseClose(InputStream bodyStream, Response response) {
         return new FilterInputStream(bodyStream) {
             @Override
@@ -123,6 +129,7 @@ public class FileStorageManagerImpl implements FileStorageManager {
     @Override
     public String fileUpload(MultipartFile file) throws DavinciServiceException {
         DavinciResult<String> result = this.fileManagerFeign.fileUpload(file);
+        requireDavinciResult(result, "fileUpload");
         if (result.isSuccess()) {
             return result.getData();
         }
@@ -132,6 +139,7 @@ public class FileStorageManagerImpl implements FileStorageManager {
     @Override
     public String fileUpload(String moduleCategory, MultipartFile file) throws DavinciServiceException {
         DavinciResult<String> result = this.fileManagerFeign.fileUpload(moduleCategory, file);
+        requireDavinciResult(result, "fileUpload(module)");
         if (result.isSuccess()) {
             return result.getData();
         }
@@ -141,6 +149,7 @@ public class FileStorageManagerImpl implements FileStorageManager {
     @Override
     public String bigFileUpload(MultipartFile file) throws DavinciServiceException {
         DavinciResult<String> result = this.fileManagerFeign.bigFileUpload(file);
+        requireDavinciResult(result, "bigFileUpload");
         if (result.isSuccess()) {
             return result.getData();
         }
@@ -150,6 +159,7 @@ public class FileStorageManagerImpl implements FileStorageManager {
     @Override
     public String bigFileUpload(String moduleCategory, MultipartFile file) throws DavinciServiceException {
         DavinciResult<String> result = this.fileManagerFeign.bigFileUpload(moduleCategory, file);
+        requireDavinciResult(result, "bigFileUpload(module)");
         if (result.isSuccess()) {
             return result.getData();
         }
@@ -159,6 +169,9 @@ public class FileStorageManagerImpl implements FileStorageManager {
     @Override
     public byte[] fileDownload(String path) throws DavinciServiceException {
         try (Response response = this.fileManagerFeign.fileDownload(path)) {
+            if (response == null) {
+                return null;
+            }
             if (response.body() == null) {
                 return null;
             }
@@ -174,13 +187,18 @@ public class FileStorageManagerImpl implements FileStorageManager {
     public InputStream fileDownloadStream(String path) throws DavinciServiceException {
         Response response = this.fileManagerFeign.fileDownload(path);
         try {
+            if (response == null) {
+                return null;
+            }
             if (response.body() == null) {
                 response.close();
                 return null;
             }
             return attachResponseClose(response.body().asInputStream(), response);
         } catch (IOException e) {
-            response.close();
+            if (response != null) {
+                response.close();
+            }
             throw new DavinciServiceException("FILE_DOWNLOAD_IO", "调用Davinci-portal服务，获取文件流接口异常");
         }
     }
@@ -191,6 +209,7 @@ public class FileStorageManagerImpl implements FileStorageManager {
             return "";
         }
         DavinciResult<String> result = this.fileManagerFeign.getFileData(path);
+        requireDavinciResult(result, "getFileData");
         if (result.isSuccess()) {
             return result.getData();
         }
@@ -200,6 +219,7 @@ public class FileStorageManagerImpl implements FileStorageManager {
     @Override
     public List<String> remove(FileRemoveDTO dto) throws DavinciServiceException {
         DavinciResult<List<String>> result = this.fileManagerRestFeign.remove(dto);
+        requireDavinciResult(result, "remove");
         if (result.isSuccess()) {
             return result.getData();
         }