fix: 统一工作流三个出口的错误反馈

- 关联 EASY-2，补齐安全错误、节点展示与执行标识

- 保留历史可读摘要并验证接口、SSE 与界面兼容

easyflow-ui-admin/app/src/api/request.ts

@@ -25,7 +25,11 @@ import {
 } from '#/utils/workflow-share-context';
 
 import { refreshTokenApi } from './core';
-import { isInactiveSseRequest } from './sseRequestLifecycle';
+import {
+  isInactiveSseRequest,
+  readSseRequestError,
+  SseRequestError,
+} from './sseRequestLifecycle';
 
 const { apiURL } = useAppConfig(import.meta.env, import.meta.env.PROD);
 const ERROR_MESSAGE_DEDUP_WINDOW = 800;
@@ -235,7 +239,7 @@ export class SseClient {
       });
 
       if (!res.ok) {
-        const error = new Error(`HTTP ${res.status}: ${res.statusText}`);
+        const error = await readSseRequestError(res);
         options?.onError?.(error);
         return;
       }
@@ -258,7 +262,7 @@ export class SseClient {
           }
         }
         showErrorOnce(errorMessage);
-        options?.onError?.(new Error(errorMessage));
+        options?.onError?.(new SseRequestError(res.status, errorMessage));
         return;
       }