fix(admin): accept multi-value 发布类型 on header-nav save

header_newposts_types is multi-select but PHP schema used type=select,
so validate() rejected arrays with 422. Use checkbox and allow
select+multiple arrays in SchemaProvider.

assets/admin/src/schema/sections/page-display/index.js

@@ -134,7 +134,7 @@ export const pageDisplaySchemas = {
             { label: '紫色', value: 'jb-purple' },
             { label: '粉色', value: 'jb-pink' },
           ], dependsOn: { key: 'header_newposts_enabled', value: true } },
-          { key: 'header_newposts_types', label: '发布类型', type: 'select', multiple: true, default: ['post'], options: [
+          { key: 'header_newposts_types', label: '发布类型', type: 'checkbox', default: ['post'], options: [
             { label: '文章', value: 'post' },
             { label: '帖子', value: 'topic' },
             { label: '商品', value: 'product' },