perf(frontend): 工具页分页/历史截断/轻量轮询/共享纯逻辑（审查 F5/F6/F9/F12/G3）

- F9 新增 useTablePaging composable 并接入 7 个工具页"匹配结果"表（只切渲染窗口，
  不加选择语义；每页 100 条）+ 深色分页样式
- F6 历史任务抽屉渲染截断（默认 50 条 + "显示全部/收起"），全选口径改为当前可见条目
- F5 新增 task-progress-polling 适配器：等待任务终态的紧循环走 /tasks/progress/light，
  异常或空响应回退重型 batch；已接入跟价/定时匹配的 waitForTaskTerminal
- F12 背景图 bg.jpg 251KB → 166KB（1920 宽 + quality 80，image-set 仍优先 webp）
- G3 抽出共享纯逻辑 task-queue-state（开始时间表序列化校验 + 记录缺失错误判定），
  5 个工具页删除逐字重复实现
- 新增 4 个单测文件（分页切片/历史截断/轻量轮询归一/任务队列纯逻辑）

frontend-vue/src/pages/brand/components/BrandPriceTrackTab.vue

@@ -164,7 +164,7 @@
           <template #cards-extra>
             <div class="subsection-title">匹配结果</div>
             <div v-if="!matchedItems.length" class="match-empty">完成「匹配店铺」后，在此展示匹配结果，确认无误后再启动任务。</div>
-            <el-table v-else :data="matchedItems" :row-key="rowKeyForMatch" :highlight-current-row="false"
+            <el-table v-else :data="pagedMatchedItems" :row-key="rowKeyForMatch" :highlight-current-row="false"
               class="result-table match-table">
               <el-table-column prop="shopName" label="店铺名" min-width="100" />
               <el-table-column label="匹配" width="72" align="center">
@@ -187,6 +187,14 @@
                 </template>
               </el-table-column>
             </el-table>
+            <el-pagination
+              v-if="matchedTotal > matchedPageSize"
+              class="matched-pagination"
+              layout="total, prev, pager, next"
+              :total="matchedTotal"
+              :page-size="matchedPageSize"
+              v-model:current-page="matchedPage"
+            />
           </template>
           <template #item-actions="{ item }">
             <button v-if="canDownload(itemSource(item))" type="button" class="download"
@@ -257,9 +265,12 @@ import {
   type PriceTrackShopQueueItem,
   type PriceTrackTaskDetailVo,
 } from '@/shared/api/java-modules'
+import { getPollingProgressBatch } from '@/shared/api/task-progress-polling.ts'
 import { formatDateTime } from '@/shared/utils/datetime'
 import { uploadPathsToJava } from '@/shared/utils/upload-to-java'
 import { runBatchDelete } from '@/shared/utils/batch-delete'
+import { isRecordMissingError } from '@/shared/utils/task-queue-state.ts'
+import { useTablePaging } from '@/shared/composables/useTablePaging.ts'
 
 const ziniaoVersion = useZiniaoVersion()
 
@@ -277,6 +288,14 @@ const shopInput = ref('')
 const candidates = ref<PriceTrackCandidateVo[]>([])
 const selectedCandidates = ref<PriceTrackCandidateVo[]>([])
 const matchedItems = ref<PriceTrackShopQueueItem[]>([])
+
+// F9：匹配结果表分页（只切渲染窗口，不加选择语义）
+const {
+  page: matchedPage,
+  pageSize: matchedPageSize,
+  total: matchedTotal,
+  paged: pagedMatchedItems,
+} = useTablePaging(matchedItems)
 const adding = ref(false)
 const matching = ref(false)
 const pushing = ref(false)
@@ -809,11 +828,6 @@ function rowKeyForMatch(row: { shopName?: string; shopId?: number | string | nul
   return `${(row.shopName || '').trim()}\u0001${row.shopId ?? ''}`
 }
 
-function isRecordMissingError(error: unknown) {
-  const message = error instanceof Error ? error.message : String(error || '')
-  return /记录不存在|不存在|已删除|not\s*found|404/i.test(message)
-}
-
 function priceTrackModeForAppClient() {
   return statusModeEnabled.value ? 'status' : 'asin'
 }
@@ -1006,7 +1020,10 @@ async function waitForTaskTerminal(taskId: number) {
   while (true) {
     if (disposed) return 'STOPPED'
     try {
-      const batch = await getPriceTrackTaskProgressBatch([taskId])
+      // F5：等待终态的紧循环只读 status（轻量白名单覆盖），走 light 端点减小轮询响应体，异常回退重型 batch
+  const batch = await getPollingProgressBatch('priceTrack', [taskId], {
+    fallback: () => getPriceTrackTaskProgressBatch([taskId]),
+  })
       if (transientErrorCount > 0) {
         queuePushResult.value = `任务 ${taskId} 服务已恢复，继续等待执行结果...`
       }