refactor(frontend): 金额正则/分页/抽屉状态/行编辑与下拉收口

- 金额形态正则收进 utils/validate.ts 单点导出（此前四页各写，精度
  调整漏改一页即「A 页拦得住 B 页放行后端 400」或历史行无法编辑）
- params 版本/历史两抽屉的手写分页五件套换 usePagedList（白得请求
  序号防竞态——快速翻页旧响应覆盖新页的手写坑不再复现）
- 业务抽屉三份 id 状态收为 drawerRowId computed（单一状态源，消除
  「标题 A 业务、留痕表 B 业务」的失同步面）
- useEditingRow（三页逐字相同的 computed）与 useDropdownOptions
  （取数失败不阻断列表的骨架）收口，映射函数由调用方给出
- e2e 冒烟：基础数据 13 步 + 业务全链路 16 步全过

Co-Authored-By: Claude Code <noreply@anthropic.com>

frontend/src/views/system/params/index.vue

@@ -14,6 +14,7 @@ import type {
 } from '@/api/params'
 import AppPagination from '@/components/table/AppPagination.vue'
 import { useConfirmAction } from '@/composables/useConfirmAction'
+import { usePagedList } from '@/composables/usePagedList'
 import { handledError } from '@/utils/error'
 
 /**
@@ -189,25 +190,20 @@ async function submitAll(): Promise<void> {
 // ==================== 版本管理抽屉 ====================
 
 const versionVisible = ref(false)
-const batches = ref<ParamBatch[]>([])
-const batchesTotal = ref(0)
-const batchesPage = ref(1)
-const batchesPageSize = ref(10)
-const batchesLoading = ref(false)
 const detailCache = reactive<Record<number, ParamBatchDetail>>({})
 
-async function loadBatches(): Promise<void> {
-  batchesLoading.value = true
-  try {
-    const page = await paramsApi.listBatches({ pageNum: batchesPage.value, pageSize: batchesPageSize.value })
-    batches.value = page.list
-    batchesTotal.value = page.total
-  } catch (error) {
-    handledError(error)
-  } finally {
-    batchesLoading.value = false
-  }
-}
+// 分页五件套换 usePagedList：手写版没有请求序号防竞态（快速翻页时旧响应
+// 后到会覆盖新页数据）与页码回退——正是该 composable 注释里写明已修过的坑
+const {
+  records: batches,
+  total: batchesTotal,
+  pageNum: batchesPage,
+  pageSize: batchesPageSize,
+  loading: batchesLoading,
+  load: loadBatches,
+  onPageChange: onBatchesPageChange,
+  onSizeChange: onBatchesSizeChange,
+} = usePagedList<ParamBatch, Record<string, never>>(paramsApi.listBatches, () => ({}))
 
 async function detailOf(batch: ParamBatch): Promise<ParamBatchDetail> {
   if (detailCache[batch.id]) return detailCache[batch.id]
@@ -299,11 +295,21 @@ function openVersionDrawer(): void {
 
 const historyVisible = ref(false)
 const historyItem = ref<ParamCatalogItem | null>(null)
-const historyRows = ref<ParamHistory[]>([])
-const historyTotal = ref(0)
-const historyPage = ref(1)
-const historyPageSize = ref(10)
-const historyLoading = ref(false)
+
+// 历史抽屉分页同样收口 usePagedList；fetcher 闭包当前参数的编码
+const {
+  records: historyRows,
+  total: historyTotal,
+  pageNum: historyPage,
+  pageSize: historyPageSize,
+  loading: historyLoading,
+  load: loadHistory,
+  onPageChange: onHistoryPageChange,
+  onSizeChange: onHistorySizeChange,
+} = usePagedList<ParamHistory, Record<string, never>>(
+  (params) => paramsApi.getParamHistory(historyItem.value!.param_code, params),
+  () => ({}),
+)
 
 function openHistory(item: ParamCatalogItem): void {
   historyItem.value = item
@@ -312,23 +318,6 @@ function openHistory(item: ParamCatalogItem): void {
   void loadHistory()
 }
 
-async function loadHistory(): Promise<void> {
-  if (!historyItem.value) return
-  historyLoading.value = true
-  try {
-    const page = await paramsApi.getParamHistory(historyItem.value.param_code, {
-      pageNum: historyPage.value,
-      pageSize: historyPageSize.value,
-    })
-    historyRows.value = page.list
-    historyTotal.value = page.total
-  } catch (error) {
-    handledError(error)
-  } finally {
-    historyLoading.value = false
-  }
-}
-
 // ==================== 计算预览抽屉 ====================
 
 const previewVisible = ref(false)
@@ -667,8 +656,8 @@ onMounted(() => {
           :total="batchesTotal"
           :page-num="batchesPage"
           :page-size="batchesPageSize"
-          @page-change="(p: number) => { batchesPage = p; void loadBatches() }"
-          @size-change="(s: number) => { batchesPageSize = s; batchesPage = 1; void loadBatches() }"
+          @page-change="onBatchesPageChange"
+          @size-change="onBatchesSizeChange"
         />
       </div>
     </el-drawer>
@@ -692,8 +681,8 @@ onMounted(() => {
         :total="historyTotal"
         :page-num="historyPage"
         :page-size="historyPageSize"
-        @page-change="(p: number) => { historyPage = p; void loadHistory() }"
-        @size-change="(s: number) => { historyPageSize = s; historyPage = 1; void loadHistory() }"
+        @page-change="onHistoryPageChange"
+        @size-change="onHistorySizeChange"
       />
     </el-drawer>