task-59(账号/权限页面): 实现数据权限分组列表和摘要

新增 shop-group-model.ts 解析 Java ShopManageGroupItemVo(camel)并汇总(groupCount/memberTotal)；
shop-group-api.ts GET /api/admin/shop-manages/groups；GroupsPage 去内联 http，改走 adapter
展示分组列表 + 顶部摘要统计卡。8 用例全过，435 单测 + build 绿。

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

@@ -0,0 +1,78 @@
+<script setup lang="ts">
+import { computed, onMounted, ref } from 'vue'
+import { ElMessage } from 'element-plus'
+import { fetchShopGroups } from './shop-group-api'
+import { shopGroupSummary, type ShopGroupItem } from './shop-group-model'
+
+const loading = ref(false)
+const rows = ref<ShopGroupItem[]>([])
+const summary = computed(() => shopGroupSummary(rows.value))
+
+async function loadGroups() {
+  loading.value = true
+  try {
+    rows.value = await fetchShopGroups()
+  } catch (error) {
+    ElMessage.error(error instanceof Error ? error.message : '数据权限分组加载失败')
+  } finally {
+    loading.value = false
+  }
+}
+
+onMounted(loadGroups)
+</script>
+
+<template>
+  <div class="page-stack">
+    <div class="page-heading">
+      <div>
+        <h2>数据权限分组</h2>
+        <p>管理店铺数据访问分组和组员范围。</p>
+      </div>
+    </div>
+    <el-row :gutter="12" style="margin-bottom: 12px">
+      <el-col :span="8">
+        <el-card shadow="never">
+          <div class="stat-block">
+            <span class="stat-label">分组总数</span>
+            <span class="stat-value">{{ summary.groupCount }}</span>
+          </div>
+        </el-card>
+      </el-col>
+      <el-col :span="8">
+        <el-card shadow="never">
+          <div class="stat-block">
+            <span class="stat-label">组员总数</span>
+            <span class="stat-value">{{ summary.memberTotal }}</span>
+          </div>
+        </el-card>
+      </el-col>
+    </el-row>
+    <el-card shadow="never">
+      <el-table v-loading="loading" :data="rows" stripe>
+        <el-table-column type="index" label="序号" width="90" />
+        <el-table-column prop="name" label="分组名称" min-width="220" />
+        <el-table-column prop="leaderUsername" label="组长" width="180" />
+        <el-table-column prop="memberCount" label="组员数量" width="120" />
+        <el-table-column prop="createdAt" label="创建时间" min-width="180" />
+      </el-table>
+    </el-card>
+  </div>
+</template>
+
+<style scoped>
+.stat-block {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+}
+.stat-label {
+  color: var(--el-text-color-secondary);
+  font-size: 13px;
+}
+.stat-value {
+  font-size: 24px;
+  font-weight: 600;
+  line-height: 1.2;
+}
+</style>