added missing methods

packages/app/src/models/user/index.js

@@ -131,4 +131,28 @@ export default class User {
 
         return data
     }
+
+    static async checkUsernameAvailability(username) {
+        const { data } = await app.cores.api.customRequest({
+            method: "GET",
+            url: `/user/username_available`,
+            params: {
+                username,
+            }
+        })
+
+        return data
+    }
+
+    static async checkEmailAvailability(email) {
+        const { data } = await app.cores.api.customRequest({
+            method: "GET",
+            url: `/user/email_available`,
+            params: {
+                email,
+            }
+        })
+
+        return data
+    }
 }