Replace type UserID with a structure

src/controllers/admin_api.rs

@@ -18,7 +18,7 @@ struct FindUserResult {
 pub async fn find_username(req: web::Form<FindUserNameReq>, users: web::Data<Addr<UsersActor>>) -> impl Responder {
     let res = users.send(FindUserByUsername(req.0.username)).await.unwrap();
     HttpResponse::Ok().json(FindUserResult {
-        user_id: res.0.map(|r| r.uid)
+        user_id: res.0.map(|r| r.uid.0)
     })
 }