feat(workflowService): 优化工作流配置获取方式，移除冗余函数并直接使用配置常量

src/services/workflowService.ts

@@ -76,18 +76,14 @@ interface WorkflowConfig {
   apiUrl: string;
 }
 
-/**
- * Get Workflow configuration from environment variables
- */
-const getWorkflowConfig = (): WorkflowConfig => {
-  return {
-    apiUrl: import.meta.env.VITE_WORKFLOW_PROXY_URL,
-  };
+const WORKFLOW_TIMEOUT_MS = 150_000;
+const workflowConfig: WorkflowConfig = {
+  apiUrl: import.meta.env.VITE_WORKFLOW_PROXY_URL,
 };
+const configuredBaseUrl = import.meta.env.VITE_API_BASE_URL;
 
 /** Normalize workflow-generated export URLs to the configured backend origin. */
 const normalizeExportDownloadUrl = (downloadUrl: string): string => {
-  const configuredBaseUrl = import.meta.env.VITE_API_BASE_URL;
   if (!configuredBaseUrl || !downloadUrl) return downloadUrl;
 
   try {
@@ -147,9 +143,7 @@ export const triggerDocumentWorkflow = async (
   sessionId: string
 ): Promise<{ content: string; exportRecord?: ExportRecordInfo }> => {
   try {
-    const config = getWorkflowConfig();
-
-    if (!config.apiUrl) {
+    if (!workflowConfig.apiUrl) {
       return { content: '工作流未配置，无法生成文档。请检查前端环境配置。' };
     }
 
@@ -164,7 +158,7 @@ export const triggerDocumentWorkflow = async (
     // 1. chatId: 带时间戳的唯一ID,确保每次请求都被视为新请求
     // 2. sessionId: 原始会话ID,传递给工作流,工作流会将其传递给后端 /api/v1/export/records
     // 3. 后端在创建文档时会使用这个sessionId,确保同一会话的多个文档共用相同的session_id
-    const response = await fetchWithTimeout(config.apiUrl, {
+    const response = await fetchWithTimeout(workflowConfig.apiUrl, {
       method: 'POST',
       headers: {
         'Content-Type': 'application/json',
@@ -182,7 +176,7 @@ export const triggerDocumentWorkflow = async (
           },
         ],
       } as WorkflowRequest),
-    });
+    }, WORKFLOW_TIMEOUT_MS);
 
     if (!response.ok) {
       const errorText = await response.text();