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/BrandWithdrawTab.vue

@@ -115,7 +115,7 @@
           </div>
           <div v-else class="match-zone-scroll">
             <el-table
-              :data="matchedItems"
+              :data="pagedMatchedItems"
               :row-key="rowKeyForMatch"
               :highlight-current-row="false"
               class="result-table match-table"
@@ -168,6 +168,14 @@
                 </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"
+            />
           </div>
         </div>
 
@@ -257,6 +265,8 @@ import { useZiniaoVersion } from "@/shared/utils/ziniao-version";
 import { formatDateTime } from '@/shared/utils/datetime'
 import { useHistoryPolling } from '@/shared/composables/useHistoryPolling'
 import { runBatchDelete } from '@/shared/utils/batch-delete'
+import { isRecordMissingError, parseTaskStartTimes, removeTaskStartTime, upsertTaskStartTime } from '@/shared/utils/task-queue-state.ts'
+import { useTablePaging } from '@/shared/composables/useTablePaging.ts'
 
 const MAX_TRANSIENT_ERRORS = 30;
 const ziniaoVersion = useZiniaoVersion();
@@ -276,6 +286,14 @@ const reservedAmount = ref(0);
 const candidates = ref<WithdrawCandidateVo[]>([]);
 const selectedCandidates = ref<WithdrawCandidateVo[]>([]);
 const matchedItems = ref<WithdrawShopQueueItem[]>([]);
+
+// 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 historyItems = ref<WithdrawHistoryItem[]>([]);
 const dashboard = ref<WithdrawDashboardVo>({
   candidateCount: 0,
@@ -700,15 +718,7 @@ function loadTaskStartTimes() {
       typeof window !== "undefined"
         ? window.localStorage.getItem(taskStartTimeStorageKey())
         : null;
-    const parsed = raw ? JSON.parse(raw) : {};
-    const next: Record<number, string> = {};
-    for (const [taskId, value] of Object.entries(parsed || {})) {
-      const numericTaskId = Number(taskId);
-      if (!Number.isFinite(numericTaskId) || numericTaskId <= 0) continue;
-      if (typeof value !== "string" || !value.trim()) continue;
-      next[numericTaskId] = value;
-    }
-    taskStartTimes.value = next;
+    taskStartTimes.value = parseTaskStartTimes(raw);
   } catch {
     taskStartTimes.value = {};
   }
@@ -716,18 +726,13 @@ function loadTaskStartTimes() {
 
 function setTaskStartTime(taskId: number, startedAt = new Date().toISOString()) {
   if (!Number.isFinite(taskId) || taskId <= 0) return;
-  taskStartTimes.value = {
-    ...taskStartTimes.value,
-    [taskId]: startedAt,
-  };
+  taskStartTimes.value = upsertTaskStartTime(taskStartTimes.value, taskId, startedAt);
   saveTaskStartTimes();
 }
 
 function clearTaskStartTime(taskId?: number | null) {
   if (!taskId || !(taskId in taskStartTimes.value)) return;
-  const next = { ...taskStartTimes.value };
-  delete next[taskId];
-  taskStartTimes.value = next;
+  taskStartTimes.value = removeTaskStartTime(taskStartTimes.value, taskId);
   saveTaskStartTimes();
 }
 
@@ -753,11 +758,6 @@ function resetQueueWorkerIfIdle() {
   saveQueueState();
 }
 
-function isRecordMissingError(error: unknown) {
-  const message = error instanceof Error ? error.message : String(error || "");
-  return /记录不存在|任务不存在|不存在|已删除|not\s*found|404/i.test(message);
-}
-
 function removeHistoryItemLocally(item: WithdrawHistoryItem) {
   historyItems.value = historyItems.value.filter((row) => {
     if (item.resultId != null && row.resultId === item.resultId) return false;