feat: 分页组件支持 pageSize 浏览器缓存

- 为 Pagination 组件添加 cacheKey 属性，支持将 pageSize 缓存到 localStorage
- 组件挂载时自动恢复缓存的 pageSize 设置
- 为各页面的分页组件配置独立的缓存键
- 仅在显示 pageSize 选择器时启用缓存恢复

Closes #105

Co-Authored-By: AAEE86 <33052466+AAEE86@users.noreply.github.com>

frontend/src/features/usage/components/UsageRecordsTable.vue

@@ -495,6 +495,7 @@
         :total="totalRecords"
         :page-size="pageSize"
         :page-size-options="pageSizeOptions"
+        cache-key="usage-records-page-size"
         @update:current="$emit('update:currentPage', $event)"
         @update:page-size="$emit('update:pageSize', $event)"
       />