task-283(后台迁移收尾/发布): admin-vue 后台工程入库 + Flask 后台整体退役

- 新后台 admin-frontend-vue 整工程入库(base=/admin-vue/、History 路由、Nginx 静态托管方案与 verify-dist 校验)
- Java AdminConsoleController 改为入口重定向: /admin|/admin.html、/login|/login.html -> /admin-vue/; 删除 classpath:static 旧 admin.html/login.html 单页与 admin.js 副本
- Flask 后台整体退役: 删除 admin_api/auth/main 蓝图、web_source 页面、static 脚本与 admin 相关测试; app.py 收敛为仅注册 version_bp(/api/version、/api/version/latest, 供桌面端更新检查)
- AdminApiGuardFilterTest 豁免样例路径 /admin.html -> /admin-vue/

admin-frontend-vue/src/pages/account/GroupsPage.vue

@@ -18,14 +18,19 @@ const isSuperAdmin = computed(() => session.isSuperAdmin)
 const currentUserId = computed(() => session.user?.id ?? null)
 // 客户端分页：全量拉取后按页切片展示。
 const page = ref(1)
-const pageSize = 10
+const pageSize = ref(10)
 const total = computed(() => rows.value.length)
-const pagedRows = computed(() => rows.value.slice((page.value - 1) * pageSize, page.value * pageSize))
+const pagedRows = computed(() => rows.value.slice((page.value - 1) * pageSize.value, page.value * pageSize.value))
 
 function changePage(p: number) {
   page.value = p
 }
 
+function changeSize(size: number) {
+  pageSize.value = size
+  page.value = 1
+}
+
 function canEditOf(group: ShopGroupItem): boolean {
   if (isSuperAdmin.value) return true
   return currentUserId.value != null && group.leaderUserId != null && currentUserId.value === group.leaderUserId
@@ -75,7 +80,6 @@ onMounted(loadGroups)
         <h2>数据权限分组</h2>
         <p>管理店铺数据访问分组和组员范围。组长不可更改，组员为普通账号。</p>
       </div>
-      <el-button type="primary" @click="openCreate">新建分组</el-button>
     </div>
     <el-row :gutter="12" style="margin-bottom: 12px">
       <el-col :span="8">
@@ -96,8 +100,10 @@ onMounted(loadGroups)
       </el-col>
     </el-row>
     <el-card shadow="never">
+      <div class="table-toolbar">
+        <el-button type="primary" @click="openCreate">新建分组</el-button>
+      </div>
       <el-table v-loading="loading" :data="pagedRows" stripe>
-        <el-table-column type="index" label="序号" min-width="80" />
         <el-table-column prop="name" label="分组名称" min-width="180" />
         <el-table-column prop="leaderUsername" label="组长" min-width="170" />
         <el-table-column prop="memberCount" label="组员数量" min-width="100" />
@@ -123,7 +129,7 @@ onMounted(loadGroups)
         </el-table-column>
       </el-table>
       <div class="table-footer">
-        <el-pagination background layout="prev, pager, next, jumper" :total="total" :page-size="pageSize" :current-page="page" @current-change="changePage" />
+        <el-pagination background layout="sizes, prev, pager, next, jumper" :total="total" :page-size="pageSize" :page-sizes="[10, 20, 50, 100]" :current-page="page" @current-change="changePage" @size-change="changeSize" />
       </div>
     </el-card>
     <GroupEditorDialog