refactor(品牌工具页): 抽取 formatDateTime 与 uploadPathsToJava 公共工具

- 新增 shared/utils/datetime.ts：13 个品牌页逐字重复的 formatDateTime 收敛为一处；
  语义不同的 3 个变体（toLocaleString / 字符串切片 / 支持时间戳）保留不动
- 新增 shared/utils/upload-to-java.ts：10 个品牌页的上传循环收敛，api 依赖注入便于单测；
  保留 uploadOss（品牌Tab）与 returnEmptyWhenUnavailable（跟价）两处行为差异
- 补 datetime / upload-to-java 单测 10 例

净减约 327 行；vue-tsc 构建与 690 个前端单测全通过

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

@@ -272,6 +272,7 @@ import {
   countryLabel,
   sanitizeCountryCodes,
 } from "@/shared/country-options";
+import { formatDateTime } from '@/shared/utils/datetime'
 
 const MAX_TRANSIENT_ERRORS = 30;
 /** 任务终态后等待结果文件（Java 侧异步生成）的最大轮次，12 × 10s ≈ 2 分钟 */
@@ -447,19 +448,6 @@ function createSubmissionId(taskId: number, shopName?: string) {
   return `patrol-delete:${taskId}:${shopName || "shop"}:${Date.now()}`;
 }
 
-function formatDateTime(value?: string) {
-  if (!value) return "-";
-  const date = new Date(value);
-  if (Number.isNaN(date.getTime())) return value;
-  const year = date.getFullYear();
-  const month = String(date.getMonth() + 1).padStart(2, "0");
-  const day = String(date.getDate()).padStart(2, "0");
-  const hours = String(date.getHours()).padStart(2, "0");
-  const minutes = String(date.getMinutes()).padStart(2, "0");
-  const seconds = String(date.getSeconds()).padStart(2, "0");
-  return `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`;
-}
-
 function formatMatchStatus(status?: string) {
   const value = (status || "").trim();
   const map: Record<string, string> = {