fix: 修复多处图片显示未使用getImageUrl的问题

- Home.vue: banner图片使用getImageUrl
- admin/Products.vue: 上传预览使用getImageUrl, 修复编辑删除图片URL匹配
- admin/Banners.vue: 编辑对话框图片预览使用getImageUrl
- admin/Articles.vue: 封面图预览使用getImageUrl
- admin/Lotteries.vue: 活动图片预览使用getImageUrl

frontend/src/views/user/Home.vue

@@ -4,7 +4,7 @@
       <el-carousel height="280px" :interval="5000" arrow="hover" trigger="click">
         <el-carousel-item v-for="(banner, index) in banners" :key="index">
           <div class="banner-slide" :style="{ background: banner.bg_color || banner.bg }">
-            <img v-if="banner.image" :src="banner.image" class="banner-bg-image" />
+            <img v-if="banner.image" :src="getImageUrl(banner.image)" class="banner-bg-image" />
             <div class="banner-content">
               <h2>{{ banner.title }}</h2>
               <p>{{ banner.desc }}</p>
@@ -113,6 +113,7 @@ import { ref, onMounted, shallowRef } from 'vue'
 import { useRouter } from 'vue-router'
 import { Goods, Trophy, Document, ShoppingCart, Folder, Present, Star, Timer, ArrowRight } from '@element-plus/icons-vue'
 import { categoryApi, lotteryApi, articleApi, bannerApi } from '../../api'
+import { getImageUrl } from '../../utils/image'
 
 const router = useRouter()
 const categories = ref<any[]>([])