移除Host头验证中间件及相关逻辑，简化OAuth相关API的请求处理，优化代码结构和可读性。

app/routes/documents._index.tsx

@@ -788,14 +788,13 @@ 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,
-        jwtToken
+        loaderData.frontendJWT as string | undefined
       );
 
       if (result.error) {
@@ -863,12 +862,11 @@ 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
-        jwtToken
+        loaderData.frontendJWT as string | undefined
       );
 
       if (result.error) {