feat: category apis

src/model/http_body/category.rs

@@ -0,0 +1,10 @@
+use serde::{Deserialize, Serialize};
+use super::common::{number_stringify, OptionalI64};
+#[derive(Serialize, Deserialize)]
+pub struct CategoryInfo {
+    #[serde(with="number_stringify")]
+    pub id: OptionalI64,
+    pub name: String,
+    #[serde(with="number_stringify")]
+    pub parent_id: OptionalI64,
+}

src/model/http_body/mod.rs

@@ -1,2 +1,3 @@
 pub mod book;
-pub mod common;
+pub mod common;
+pub mod category;