feat: 附件（软件/手册下载）

app/index/model/AttachmentModel.php

@@ -0,0 +1,19 @@
+<?php
+declare (strict_types = 1);
+
+namespace app\index\model;
+
+use app\common\model\AttachmentBaseModel;
+use think\model\concern\SoftDelete;
+
+/**
+ * 附件模型
+ * @mixin \think\Model
+ */
+class AttachmentModel extends AttachmentBaseModel
+{
+    // 启用软删除
+    use SoftDelete;
+    // 软删除时间字段名
+    protected $deleteTime = 'deleted_at';
+}