fix: support App builder type in deleteWebTree + correct delete prompt

- ChannelProjectService: normalizeBuilderType accepts 'app' (Channel::BUILDER_APP)
- deleteWebTree: app type deletes public/channel/<id>/ (IPA output)
- Blade: correct pathHint for app builder type

resources/views/admin/channels/index.blade.php

@@ -454,9 +454,14 @@ layui.use(['table', 'form', 'layer'], function () {
     if (obj.event === 'edit') openForm('编辑渠道链接', obj.data, false);
     if (obj.event === 'links') openLinks(obj.data);
     if (obj.event === 'del') {
-      var pathHint = obj.data.builder_type === 'new'
-        ? ('数据库记录与 channel/' + obj.data.channel_id + '/')
-        : ('数据库记录与 web/' + obj.data.channel_id + ' 资源');
+      var pathHint;
+      if (obj.data.builder_type === 'app') {
+        pathHint = '数据库记录与生成的 IPA 文件';
+      } else if (obj.data.builder_type === 'new') {
+        pathHint = '数据库记录与 channel/' + obj.data.channel_id + '/';
+      } else {
+        pathHint = '数据库记录与 web/' + obj.data.channel_id + ' 资源';
+      }
       layer.confirm('删除后将移除 ' + pathHint + '，确认？', function (idx) {
         $.ajax({
           url: @json(url('/admin/channels')) + '/' + obj.data.id,