windows版本初步完成

lib/data/book/book_dao.dart

@@ -45,7 +45,7 @@ class BookDao {
     switch (sortMode) {
       case 1: return 'created_at DESC';
       case 2: return 'rating DESC NULLS LAST, updated_at DESC';
-      default: return 'updated_at DESC';
+      default: return 'created_at DESC';
     }
   }