Fix: table parser metadata (#15127)

### What problem does this PR solve?

This PR improves the table upload flow for CSV/Excel files by allowing
table column role configuration at upload time.

Previously, users had to:
1. Upload and parse a table file.
2. Open parser settings and manually set table column roles.
3. Re-parse the file for the roles to take effect.

This was inefficient and required an unnecessary second parse.

With this change:
1. When the knowledge base uses table parsing, the upload dialog
extracts CSV/Excel headers client-side.
2. Users can choose Auto mode or Manual mode.
3. In Manual mode, users can assign per-column roles before upload.
4. The selected parser config is sent with the upload request and
applied server-side during document creation.

Result: configured table column roles are applied from the first parse.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

Co-authored-by: Ahmad Intisar <ahmadintisar@Ahmads-MacBook-M4-Pro.local>

web/src/hooks/use-document-request.ts

@@ -69,9 +69,13 @@ export const useUploadNextDocument = () => {
     data,
     isPending: loading,
     mutateAsync,
-  } = useMutation<ResponseType<IDocumentInfo[]>, Error, File[]>({
+  } = useMutation<
+    ResponseType<IDocumentInfo[]>,
+    Error,
+    { fileList: File[]; parserConfig?: Record<string, any> }
+  >({
     mutationKey: [DocumentApiAction.UploadDocument],
-    mutationFn: async (fileList) => {
+    mutationFn: async ({ fileList, parserConfig }) => {
       if (!id) {
         return { code: 500, message: 'Dataset ID is required' };
       }
@@ -79,6 +83,9 @@ export const useUploadNextDocument = () => {
       fileList.forEach((file: any) => {
         formData.append('file', file);
       });
+      if (parserConfig) {
+        formData.append('parser_config', JSON.stringify(parserConfig));
+      }
 
       try {
         const ret = await uploadDocument(id, formData);
@@ -100,7 +107,13 @@ export const useUploadNextDocument = () => {
     },
   });
 
-  return { uploadDocument: mutateAsync, loading, data };
+  const upload = useCallback(
+    (fileList: File[], parserConfig?: Record<string, any>) =>
+      mutateAsync({ fileList, parserConfig }),
+    [mutateAsync],
+  );
+
+  return { uploadDocument: upload, loading, data };
 };
 
 export const useFetchDocumentList = (loop = true) => {