增加刷新目录树上下文菜单

frontend/src/components/Tree.vue

@@ -25,6 +25,7 @@ export default {
     this.$bus.on('file-uploaded', this.refresh)
     this.$bus.on('file-marked', this.refresh)
     this.$bus.on('file-unmarked', this.refresh)
+    this.$bus.on('tree-refresh', this.refresh)
     this.refresh()
   },
   beforeDestroy () {
@@ -34,6 +35,7 @@ export default {
     this.$bus.off('file-uploaded', this.refresh)
     this.$bus.off('file-marked', this.refresh)
     this.$bus.off('file-unmarked', this.refresh)
+    this.$bus.off('tree-refresh', this.refresh)
   },
   methods: {
     showContextMenu () {

frontend/src/components/TreeNode.vue

@@ -77,6 +77,7 @@ export default {
         { id: 'delete', label: '删除', onClick: () => this.deleteFile() },
         { type: 'separator' },
         { id: 'openInOS', label: '在系统中打开', onClick: () => this.revealInExplorer() },
+        { id: 'openInOS', label: '刷新目录树', onClick: () => this.$bus.emit('tree-refresh') },
       ]
 
       if (item.type === 'dir') {