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

app/Services/ChannelProjectService.php

@@ -71,6 +71,17 @@ class ChannelProjectService
     ): void {
         $builderType = $this->normalizeBuilderType($builderType);
 
+        // App builder channels have no static resource tree —
+        // only the DB row + optionally an IPA output directory.
+        if ($builderType === Channel::BUILDER_APP) {
+            $dir = public_path('channel/'.$channelId);
+            if (is_dir($dir) && ! $this->removeDirectory($dir)) {
+                throw new RuntimeException('删除渠道资源失败: '.$dir);
+            }
+
+            return;
+        }
+
         if ($builderType === self::BUILDER_NEW) {
             $code = Channel::normalizeNewChannelId($channelId);
             if ($code === null) {
@@ -707,8 +718,8 @@ class ChannelProjectService
         if ($builderType === '') {
             return self::BUILDER_OLD;
         }
-        if (! in_array($builderType, [self::BUILDER_OLD, self::BUILDER_NEW], true)) {
-            throw new RuntimeException('无效的渠道类型（支持: old, new）');
+        if (! in_array($builderType, [self::BUILDER_OLD, self::BUILDER_NEW, Channel::BUILDER_APP], true)) {
+            throw new RuntimeException('无效的渠道类型（支持: old, new, app）');
         }
 
         return $builderType;