修复产量报表分页翻页无效：改用watch监听page变化自动加载数据

Element Plus的@current-change事件中v-model更新时序导致
loadData()读到旧的page值，使翻页后数据不变化。
改为watch([page.page, page.pageSize])监听，数据变化后自动重载。

frontend/src/views/production/ProductionPage.vue

@@ -99,7 +99,7 @@
   </div>
 </template>
 <script setup lang="ts">
-import { ref, reactive, onMounted, toRefs } from 'vue'
+import { ref, reactive, onMounted, watch } from 'vue'
 import { ElMessage, ElMessageBox } from 'element-plus'
 import request from '@/utils/request'
 import type { ProductionRecord, ProductionDashboardSummary } from '@/types'
@@ -254,4 +254,9 @@ function handleAdjust(row: ProductionRecord){
 }
 
 onMounted(init)
+
+// 监听页码和每页条数变化，自动重新加载数据
+watch([() => page.page, () => page.pageSize], () => {
+  loadData()
+})
 </script>