fix: 修复子路径部署静态资源引用

- 修复 admin 与 usercenter 登录验证码资源在 /flow 子路径下的加载路径

- 统一 logo、空状态图、兜底头像与模型服务商图标的 BASE_URL 处理

- 补齐 usercenter 公共布局与 loading 注入的子路径兼容

easyflow-ui-admin/app/src/components/collapseViewItem/CollapseViewItem.vue

@@ -19,6 +19,7 @@ const props = defineProps({
   },
 });
 const emits = defineEmits(['delete']);
+const fallbackAvatarUrl = `${import.meta.env.BASE_URL || '/'}favicon.svg`;
 const handleDelete = (item: any) => {
   ElMessageBox.confirm($t('message.deleteAlert'), $t('message.noticeTitle'), {
     confirmButtonText: $t('button.confirm'),
@@ -40,7 +41,7 @@ const handleDelete = (item: any) => {
       <div class="el-list-item-container">
         <div class="flex-center">
           <ElAvatar :src="item.icon" v-if="item.icon" />
-          <ElAvatar v-else src="/favicon.svg" shape="circle" />
+          <ElAvatar v-else :src="fallbackAvatarUrl" shape="circle" />
         </div>
         <div class="el-list-item-content">
           <div class="title">{{ item[titleKey] }}</div>

easyflow-ui-admin/app/src/components/commonSelectModal/CommonSelectDataModal.vue

@@ -57,6 +57,7 @@ const emit = defineEmits(['getData', 'buttonClick']);
 const dialogVisible = ref(false);
 const pageDataRef = ref();
 const loading = ref(false);
+const fallbackAvatarUrl = `${import.meta.env.BASE_URL || '/'}favicon.svg`;
 const selectedIds = ref<(number | string)[]>([]);
 // 存储上一级id与选中tool.name的关联关系
 const selectedToolMap = ref<Record<number | string, SelectedMcpTool[]>>({});
@@ -231,7 +232,11 @@ const handleSearch = (query: string) => {
                     >
                       <div>
                         <ElAvatar :src="item.icon" v-if="item.icon" />
-                        <ElAvatar v-else src="/favicon.svg" shape="circle" />
+                        <ElAvatar
+                          v-else
+                          :src="fallbackAvatarUrl"
+                          shape="circle"
+                        />
                       </div>
                       <div class="title-right-container">
                         <ElText truncated class="title">
@@ -326,7 +331,11 @@ const handleSearch = (query: string) => {
                   <div class="content-sec-left-container">
                     <div>
                       <ElAvatar :src="item.icon" v-if="item.icon" />
-                      <ElAvatar v-else src="/favicon.svg" shape="circle" />
+                      <ElAvatar
+                        v-else
+                        :src="fallbackAvatarUrl"
+                        shape="circle"
+                      />
                     </div>
                     <div class="title-sec-right-container">
                       <ElText truncated class="title">