fix: 恢复图片下载重试UI，修复兼容性问题

- 恢复 workers.vue 中"图片下载重试"UI (imgDlRetry, imgDlRetryMaxRetries)
- 恢复批量代理弹窗提示文字
- 修复实例标识：有 id 用 id，没有用 name
- download.js 参数名 maxRetries -> retries，与 adapter 调用一致
- routes.js 重试下载读取配置并传递 retries

src/backend/utils/download.js

@@ -21,22 +21,22 @@ function isRetryableError(message) {
  * @param {import('playwright-core').Page} page - Playwright 页面对象
  * @param {object} [options] - 可选配置
  * @param {number} [options.timeout=60000] - 超时时间（毫秒）
- * @param {number} [options.maxRetries=3] - 最大重试次数
+ * @param {number} [options.retries=3] - 最大重试次数
  * @param {number} [options.retryDelay=1000] - 重试延迟基数（毫秒）
  * @returns {Promise<{ image?: string, imageUrl?: string, error?: string }>} 下载结果（包含原始 URL）
  */
 export async function useContextDownload(url, page, options = {}) {
-    const { timeout = 120000, maxRetries = 3, retryDelay = 1000 } = options;
+    const { timeout = 120000, retries = 3, retryDelay = 1000 } = options;
 
-    for (let attempt = 1; attempt <= maxRetries; attempt++) {
+    for (let attempt = 1; attempt <= retries; attempt++) {
         try {
             const response = await page.request.get(url, { timeout });
 
             if (!response.ok()) {
                 const status = response.status();
                 // 5xx 错误可重试
-                if (status >= 500 && attempt < maxRetries) {
-                    logger.warn('下载', `HTTP ${status}，重试 ${attempt}/${maxRetries}...`);
+                if (status >= 500 && attempt < retries) {
+                    logger.warn('下载', `HTTP ${status}，重试 ${attempt}/${retries}...`);
                     await new Promise(r => setTimeout(r, retryDelay * attempt));
                     continue;
                 }
@@ -50,8 +50,8 @@ export async function useContextDownload(url, page, options = {}) {
 
             return { image: `data:${mimeType};base64,${base64}`, imageUrl: url };
         } catch (e) {
-            if (isRetryableError(e.message) && attempt < maxRetries) {
-                logger.warn('下载', `${e.message}，重试 ${attempt}/${maxRetries}...`);
+            if (isRetryableError(e.message) && attempt < retries) {
+                logger.warn('下载', `${e.message}，重试 ${attempt}/${retries}...`);
                 await new Promise(r => setTimeout(r, retryDelay * attempt));
                 continue;
             }

src/server/api/admin/routes.js

@@ -572,7 +572,10 @@ export function createAdminRouter(context) {
                     const poolContext = queueManager?.getPoolContext?.();
                     const page = poolContext?.getFirstPage?.();
                     if (page) {
-                        downloadFn = (url) => useContextDownload(url, page);
+                        const imgDlCfg = config?.backend?.pool?.failover || {};
+                        downloadFn = (url) => useContextDownload(url, page, {
+                            retries: imgDlCfg.imgDlRetry ? (imgDlCfg.imgDlRetryMaxRetries || 3) : 1
+                        });
                     }
                 } catch { /* Pool 未初始化，使用后备方案 */ }
 

webui/src/components/settings/workers.vue

@@ -87,6 +87,9 @@ const instanceData = computed({
     set: (val) => { settingsStore.workerConfig = val; }
 });
 
+// 获取实例唯一标识（优先 id，没有则用 name）
+const getInstanceKey = (inst) => inst.id || inst.name;
+
 // 批量选择
 const selectedRowKeys = ref([]);
 const rowSelection = computed(() => ({
@@ -121,7 +124,7 @@ const openBatchProxy = () => {
 
 const handleBatchProxySave = async () => {
     const newList = (instanceData.value || []).map(inst => {
-        if (!selectedRowKeys.value.includes(inst.name)) return inst;
+        if (!selectedRowKeys.value.includes(getInstanceKey(inst))) return inst;
         return {
             ...inst,
             proxy: batchProxyForm.value.proxy ? {
@@ -152,7 +155,7 @@ const handleBatchDelete = () => {
         cancelText: '取消',
         async onOk() {
             const newList = (instanceData.value || []).filter(
-                inst => !selectedRowKeys.value.includes(inst.name)
+                inst => !selectedRowKeys.value.includes(getInstanceKey(inst))
             );
             const success = await settingsStore.saveWorkerConfig(newList);
             if (success) {
@@ -225,7 +228,8 @@ const handleEdit = (record) => {
 
 // 删除实例
 const handleDelete = async (record) => {
-    const newList = instanceData.value.filter(item => item.name !== record.name);
+    const key = getInstanceKey(record);
+    const newList = instanceData.value.filter(item => getInstanceKey(item) !== key);
     await settingsStore.saveWorkerConfig(newList);
 };
 
@@ -253,8 +257,9 @@ const handleSaveEdit = async () => {
         // 创建
         newList.push(instanceToSave);
     } else {
-        // 更新 - 用原始 name 查找
-        const index = newList.findIndex(item => item.name === editingInstance.value.name);
+        // 更新 - 用唯一标识查找
+        const editingKey = getInstanceKey(editingInstance.value);
+        const index = newList.findIndex(item => getInstanceKey(item) === editingKey);
         if (index > -1) {
             newList[index] = instanceToSave;
         }
@@ -374,6 +379,32 @@ const handleRemoveWorker = (index) => {
                                 </div>
                             </a-col>
                         </a-row>
+
+                        <a-divider style="margin: 12px 0;" />
+
+                        <a-row :gutter="16">
+                            <a-col :xs="24" :md="12">
+                                <div style="margin-bottom: 8px;">
+                                    <div style="font-weight: 600; margin-bottom: 8px;">图片下载重试</div>
+                                    <div style="font-size: 12px; color: #8c8c8c; margin-bottom: 12px;">
+                                        启用后，图片/视频下载失败时会自动重试下载（不重新生成）
+                                    </div>
+                                    <a-switch v-model:checked="poolConfig.failover.imgDlRetry" />
+                                </div>
+                            </a-col>
+
+                            <a-col :xs="24" :md="12">
+                                <div style="margin-bottom: 8px;">
+                                    <div style="font-weight: 600; margin-bottom: 8px;">下载重试次数</div>
+                                    <div style="font-size: 12px; color: #8c8c8c; margin-bottom: 12px;">
+                                        图片下载失败时的最大重试次数，范围 1-10
+                                    </div>
+                                    <a-input-number v-model:value="poolConfig.failover.imgDlRetryMaxRetries" :min="1"
+                                        :max="10" :disabled="!poolConfig.failover.imgDlRetry" style="width: 100%"
+                                        placeholder="请输入下载重试次数" />
+                                </div>
+                            </a-col>
+                        </a-row>
                     </a-collapse-panel>
                 </a-collapse>
             </div>
@@ -408,7 +439,7 @@ const handleRemoveWorker = (index) => {
 
             <!-- 实例表格 -->
             <a-table :columns="columns" :data-source="instanceData" :pagination="false"
-                :row-selection="rowSelection" row-key="name">
+                :row-selection="rowSelection" :row-key="record => record.id || record.name">
                 <template #bodyCell="{ column, record }">
                     <!-- 实例名称 -->
                     <template v-if="column.key === 'name'">
@@ -609,6 +640,9 @@ const handleRemoveWorker = (index) => {
         <!-- 批量代理设置模态框 -->
         <a-modal v-model:open="batchProxyVisible" title="批量设置代理" okText="确定" cancelText="取消"
             @ok="handleBatchProxySave">
+            <div style="font-size: 12px; color: #8c8c8c; margin-bottom: 16px;">
+                将对选中的 {{ selectedRowKeys.length }} 个实例统一设置代理
+            </div>
             <div style="margin-bottom: 16px;">
                 <a-switch v-model:checked="batchProxyForm.proxy" />
                 <span style="margin-left: 8px;">