(improvement)(chat) Add domain tree for agent and plugin setting (#718)

Co-authored-by: jolunoluo

headless/api/src/main/java/com/tencent/supersonic/headless/api/pojo/response/ItemResp.java

@@ -0,0 +1,33 @@
+package com.tencent.supersonic.headless.api.pojo.response;
+
+import com.google.common.collect.Lists;
+import com.tencent.supersonic.common.pojo.enums.TypeEnums;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class ItemResp {
+
+    private Long id;
+
+    private Long parentId;
+
+    private String name;
+
+    private TypeEnums type;
+
+    private List<ItemResp> children = Lists.newArrayList();
+
+    public ItemResp(Long id, Long parentId, String name, TypeEnums type) {
+        this.id = id;
+        this.parentId = parentId;
+        this.name = name;
+        this.type = type;
+    }
+
+}