user-auth store frontend and backend v3

backend/api/src/lib.rs

@@ -636,12 +636,13 @@ async fn list_book(
     let page: usize = params.get("page").unwrap().parse().unwrap();
     let userid: i32 = params.get("userid").unwrap().parse().unwrap();
     let sort: String = params.get("sort").unwrap().to_string();
+    let per_page: usize = 12;
 
-    let books = QueryCore::find_books_plus_meta_in_page(conn,page,12,userid, sort)
+    let books = QueryCore::find_books_plus_meta_in_page(conn,page,per_page,userid, sort)
         .await
         .expect("could not list books");
 
-let mut resbooks: Vec<BookUI> = Vec::with_capacity(12);
+let mut resbooks: Vec<BookUI> = Vec::with_capacity(per_page);
 
  for bookandmeta in books.0.into_iter() {
     let mut cover = bookandmeta.clone().book.cover;