feat: 账户时间线详情页与接口完善

- 后端新增 /admin/accounts/:accountId/usage-records 接口，支持按账户聚合多 Key 记录并分页筛选、汇总统计
  - 修复 API Key 时间线账户筛选跳过已删除账号，补充账户/Key 辅助解析
  - 前端新增 AccountUsageRecordsView、路由及账户列表“时间线”入口，支持模型/API Key 筛选与 CSV 导出
  - 补装 prettier-plugin-tailwindcss 并完成相关文件格式化

web/admin-spa/src/router/index.js

@@ -13,6 +13,7 @@ const DashboardView = () => import('@/views/DashboardView.vue')
 const ApiKeysView = () => import('@/views/ApiKeysView.vue')
 const ApiKeyUsageRecordsView = () => import('@/views/ApiKeyUsageRecordsView.vue')
 const AccountsView = () => import('@/views/AccountsView.vue')
+const AccountUsageRecordsView = () => import('@/views/AccountUsageRecordsView.vue')
 const TutorialView = () => import('@/views/TutorialView.vue')
 const SettingsView = () => import('@/views/SettingsView.vue')
 const ApiStatsView = () => import('@/views/ApiStatsView.vue')
@@ -110,6 +111,18 @@ const routes = [
       }
     ]
   },
+  {
+    path: '/accounts/:accountId/usage-records',
+    component: MainLayout,
+    meta: { requiresAuth: true },
+    children: [
+      {
+        path: '',
+        name: 'AccountUsageRecords',
+        component: AccountUsageRecordsView
+      }
+    ]
+  },
   {
     path: '/tutorial',
     component: MainLayout,