feat add http body

src/model/http_body/category.rs

@@ -1,5 +1,12 @@
 use serde::{Deserialize, Serialize};
 use super::common::{number_stringify, OptionalI64};
+#[derive(Serialize, Deserialize)]
+pub struct CategoryResp {
+    pub id: i64,
+    pub name: String,
+    pub parent_id: i64,
+}
+
 #[derive(Serialize, Deserialize)]
 pub struct CategoryInfo {
     #[serde(with="number_stringify")]