feat(web): chart content support files

web/src/views/ApplicationConfig/Cluster.tsx

@@ -2,7 +2,7 @@
  * @Author: ZhaoYing 
  * @Date: 2026-02-03 16:29:33 
  * @Last Modified by: ZhaoYing
- * @Last Modified time: 2026-03-18 19:37:15
+ * @Last Modified time: 2026-03-18 19:49:09
  */
 import { useEffect, useState, useRef, forwardRef, useImperativeHandle } from 'react'
 import { useTranslation } from 'react-i18next'
@@ -295,6 +295,7 @@ const Cluster = forwardRef<ClusterRef, { onFeaturesLoad?: (features: FeaturesCon
                     value: type,
                     label: t(`application.${type}`),
                   }))}
+                  placeholder={t('common.pleaseSelect')}
                 />
               </Form.Item>
               <Form.Item
@@ -306,6 +307,7 @@ const Cluster = forwardRef<ClusterRef, { onFeaturesLoad?: (features: FeaturesCon
                     value: type,
                     label: t(`application.${type}`),
                   }))}
+                  placeholder={t('common.pleaseSelect')}
                 />
               </Form.Item>
             </Card>}