fix(llm): 修复文件上传接口异常处理

- 优化异常信息格式，提高错误消息的可读性
- 增加对响应体中 status 字段的检查

yudao-module-llm/yudao-module-llm-biz/src/main/java/cn/iocoder/yudao/module/llm/service/http/RagHttpService.java

@@ -133,7 +133,7 @@ public class RagHttpService {
                         } else {
                             // 修改状态为 上传失败
                             updateFileState(documents, KnowledgeStatusEnum.UPLOAD_FAILED);
-                            throw new RuntimeException("文件上传失败:"+ragEmbedRespVO.getMessage());
+                            throw new RuntimeException("文件上传失败:" + ragEmbedRespVO.getMessage());
                         }
                     }
                 }
@@ -273,7 +273,7 @@ public class RagHttpService {
         JSONObject parseObject = JSON.parseObject(responseBody);
         log.info(" ========= Response Body Result: {}", responseBody);
 
-        if (parseObject.getBoolean("status")) {
+        if (parseObject.containsKey("status") && parseObject.getBoolean("status")) {
             // 修改状态为 上传成功
             updateFileState(documents, KnowledgeStatusEnum.UPLOAD_SUCCESS);
         } else {