优化 MediaCard 和 SearchSiteDialog 组件，移除全选功能并调整已选择站点的逻辑

src/components/dialog/SearchSiteDialog.vue

@@ -1,6 +1,6 @@
 <script setup lang="ts">
 import type { Site, Plugin, Subscribe } from '@/api/types'
-import { PropType } from 'vue'
+import { popScopeId, PropType } from 'vue'
 
 const props = defineProps({
   sites: {
@@ -23,6 +23,12 @@ const siteFilter = ref('')
 // 已选择站点
 const selectedSites = ref<any[]>(props.selected || [])
 
+watchEffect(() => {
+  if (!selectedSites.value && props.selected){
+    selectedSites.value = props.selected
+  }
+})
+
 // 全选/全不选按钮文字
 const checkAllText = computed(() => {
   return selectedSites.value.length < props.sites?.length ? '选择全部' : '取消全选'