feat:增加加载中组件

lib/widgets/recipe/card.dart

@@ -1,6 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:food_hub_app/config/app_config.dart';
-
 import 'package:food_hub_app/models/recipe.dart';
 import 'package:food_hub_app/widgets/common/image.dart';
 import 'package:food_hub_app/widgets/common/index.dart';
@@ -86,10 +84,7 @@ class RecipeCard extends StatelessWidget {
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
-          buildNetworkImage(
-            context,
-            '${AppConfig.imageBaseUrl}/$firstImageUrl',
-          ),
+          buildNetworkImage(context, firstImageUrl),
           SizedBox(height: 8),
           GestureDetector(
             onTap: () => navigatorToRecipeDetail(context),