优化文件上传逻辑，统一JWT令牌处理方式，简化请求头设置，提升代码可读性。

app/api/files/files-upload.ts

@@ -357,12 +357,16 @@ export async function uploadDocumentToServer(
     // const response = await fetch(`${API_BASE_URL}/admin/documents/upload`, {
     try {
       // console.log('【调试】开始fetch请求...');
+      const headers: HeadersInit = {
+        'X-File-Name': encodeURIComponent(fileName),
+        'Accept': 'application/json'
+      };
+      if (jwtToken) {
+        headers['Authorization'] = `Bearer ${jwtToken}`;
+      }
       const response = await fetch(uploadUrl, {
         method: 'POST',
-        headers: {
-          'X-File-Name': encodeURIComponent(fileName),
-          'Authorization': `Bearer ${jwtToken || ''}`
-        },
+        headers,
         body: formData
       });
       

app/routes/documents._index.tsx

@@ -788,13 +788,14 @@ export default function DocumentsIndex() {
     try {
       setAttachmentUploading(true);
       
+      const jwtToken = (loaderData.frontendJWT as string | undefined) || (loaderData.userInfo?.frontend_jwt as unknown as string | undefined);
       const result = await appendContractAttachments(
         selectedDocumentId,
         attachmentFiles,
         attachmentMergeMode,
         true, // isReprocess
         attachmentRemark || undefined,
-        loaderData.frontendJWT as string | undefined
+        jwtToken
       );
 
       if (result.error) {
@@ -862,11 +863,12 @@ export default function DocumentsIndex() {
     try {
       setTemplateUploading(true);
       
+      const jwtToken = (loaderData.frontendJWT as string | undefined) || (loaderData.userInfo?.frontend_jwt as unknown as string | undefined);
       const result = await uploadContractTemplate(
         templateFile,
         selectedDocumentId,
         undefined, // comparisonId
-        loaderData.frontendJWT as string | undefined
+        jwtToken
       );
 
       if (result.error) {

app/routes/rules-files.tsx

@@ -512,13 +512,14 @@ export default function RulesFiles() {
     try {
       setAttachmentUploading(true);
       const docId = parseInt(selectedDocumentId, 10);
+      const jwtToken = (frontendJWT as string | undefined) || (userInfo?.frontend_jwt as unknown as string | undefined);
       const result = await appendContractAttachments(
         docId,
         attachmentFiles,
         attachmentMergeMode,
         true,
         attachmentRemark || undefined,
-        frontendJWT as string | undefined
+        jwtToken
       );
       if (result.error) {
         throw new Error(result.error);