fix: 修复多页面 page_size 参数错误

- 样板库接口 page_size 上限 le=200 → le=1000
  (订单新建对话框与 AI 炫图请求 254 条触发校验失败)
- el-select 清空后 status 空串归一化
  (订单/合同/量尺/售后筛选不再发送 status=)
- 复测 page_size=254 返回 254 条完整数据

frontend/src/views/AfterSaleView.vue

@@ -61,7 +61,7 @@ const form = reactive({ title: '', description: '', order_no: '' })
 async function load() {
   loading.value = true
   try {
-    const qs = `page=${page.value}&page_size=${page_size}${status.value !== undefined ? `&status=${status.value}` : ''}`
+    const qs = `page=${page.value}&page_size=${page_size}${status.value !== undefined && status.value !== '' ? `&status=${status.value}` : ''}`
     const d = await api<any>('get', `/api/after_sales?${qs}`)
     rows.value = d.data
     total.value = d.total