修复：话题封面必填

src/pages/forumManage/topicList/components/addTopicModal/index.tsx

@@ -115,7 +115,11 @@ const AddTopicModal: FC<ModalProps & selfProps> = ({ open, onCancel, onOk, curre
             <UploadOutlined />
           </Uploader>
         </Form.Item>
-        <Form.Item label='封面' name='gambitCover'>
+        <Form.Item
+          label='封面'
+          name='gambitCover'
+          rules={[{ required: true, message: '请上传封面' }]}
+        >
           <Uploader
             fileUpload
             listType='picture-card'