feat(purchase): 采购批次号支持，同一批提交的记录可分组查看/统计

背景: 循环提交把一批物品生成多条独立申请，无法识别'哪些是同一批采购'

后端:
- purchase_request 模型新增 batch_no 字段（同一批提交共享）
- create 接口接收 batch_no，无则自动生成 BATCH-yyyyMMdd-HHmm-随机
- 新增 GET /purchase/batch/<batch_no> 按批次查询所有记录
- 批量审批接口支持按 batch_no 一键审批整批

前端:
- 提交时生成 batch_no 共享给所有行
- 列表新增批次号列（可点击）
- 新增'整批查看'弹窗：显示同批次所有记录 + 一键批量通过本批
- 操作列新增'整批'按钮

数据库需执行: ALTER TABLE purchase_request ADD COLUMN batch_no VARCHAR(100);

inventory-web/src/api/purchase.ts

@@ -89,7 +89,8 @@ export function approvePurchase(id: number, data: {
 
 // 批量审批采购申请（循环提交产生的多条记录可一次审批）
 export function batchApprovePurchase(data: {
-  ids: number[]
+  ids?: number[]
+  batch_no?: string
   action: 'approve' | 'reject'
   reject_reason?: string
 }) {
@@ -100,6 +101,14 @@ export function batchApprovePurchase(data: {
   })
 }
 
+// 按批次号查询同批次的采购申请记录
+export function getPurchaseByBatch(batchNo: string) {
+  return request({
+    url: `/purchase/batch/${encodeURIComponent(batchNo)}`,
+    method: 'get'
+  })
+}
+
 // 获取可选审批人列表
 export function getPurchaseApprovers() {
   return request({

inventory-web/src/views/purchase/index.vue

@@ -52,14 +52,24 @@
       </el-table-column>
       <el-table-column prop="requester_name" label="申请人" width="100" />
       <el-table-column prop="approver_name" label="审批人" width="100" />
+      <!-- ★ 批次号列：同一批提交的记录共享，可点击查看整批 -->
+      <el-table-column label="批次号" width="170">
+        <template #default="{ row }">
+          <el-link v-if="row.batch_no" type="primary" :underline="false" @click="openBatchDialog(row.batch_no)">
+            {{ row.batch_no }}
+          </el-link>
+          <span v-else style="color:#ccc">-</span>
+        </template>
+      </el-table-column>
       <el-table-column label="状态" width="100" align="center">
         <template #default="{ row }">
           <el-tag :type="statusTagType(row.status)" size="small">{{ row.status_text }}</el-tag>
         </template>
       </el-table-column>
-      <el-table-column label="操作" width="200" fixed="right" align="center">
+      <el-table-column label="操作" width="240" fixed="right" align="center">
         <template #default="{ row }">
           <el-button type="primary" link size="small" @click="openDetailDialog(row)">详情</el-button>
+          <el-button v-if="row.batch_no" type="info" link size="small" @click="openBatchDialog(row.batch_no)">整批</el-button>
           <template v-if="row.status === 0 && canApprove">
             <el-button type="success" link size="small" @click="handleApprove(row)">通过</el-button>
             <el-button type="danger" link size="small" @click="openRejectDialog(row)">驳回</el-button>
@@ -272,6 +282,41 @@
       </div>
     </el-dialog>
 
+    <!-- ========== 整批查看弹窗（同一批提交的所有记录） ========== -->
+    <el-dialog v-model="batchDialogVisible" title="采购批次详情" width="900px" destroy-on-close :close-on-click-modal="false" :close-on-press-escape="false">
+      <div style="margin-bottom: 12px;">
+        <span style="font-weight: 600;">批次号:</span>
+        <el-tag style="margin-left: 6px;">{{ currentBatchNo }}</el-tag>
+        <span style="margin-left: 12px; color: #909399;">共 {{ batchItems.length }} 条采购记录</span>
+        <el-button
+            v-if="canApprove && batchItems.some(i => i.status === 0)"
+            type="success" size="small" style="float: right;"
+            :loading="batchLoading" @click="handleBatchApproveByNo"
+        >批量通过本批</el-button>
+      </div>
+      <el-table :data="batchItems" border size="small" max-height="450">
+        <el-table-column type="index" label="#" width="40" align="center" />
+        <el-table-column prop="request_no" label="单号" width="170" />
+        <el-table-column prop="name" label="物品" min-width="130" show-overflow-tooltip />
+        <el-table-column prop="spec_model" label="规格" min-width="100" show-overflow-tooltip />
+        <el-table-column prop="quantity" label="数量" width="60" align="center" />
+        <el-table-column label="状态" width="90" align="center">
+          <template #default="{ row }">
+            <el-tag :type="statusTagType(row.status)" size="small">{{ row.status_text }}</el-tag>
+          </template>
+        </el-table-column>
+        <el-table-column prop="purchase_date" label="采购日期" width="110" />
+        <el-table-column label="操作" width="70" align="center">
+          <template #default="{ row }">
+            <el-button type="primary" link size="small" @click="openDetailDialog(row)">详情</el-button>
+          </template>
+        </el-table-column>
+      </el-table>
+      <template #footer>
+        <el-button @click="batchDialogVisible = false">关闭</el-button>
+      </template>
+    </el-dialog>
+
     <!-- ========== 驳回原因弹窗 ========== -->
     <el-dialog v-model="rejectDialogVisible" title="驳回申请" width="480px" destroy-on-close :close-on-click-modal="false" :close-on-press-escape="false">
       <el-form label-width="80px">
@@ -316,7 +361,8 @@ import { useUserStore } from '@/stores/user'
 import { searchMaterialPurchase } from '@/api/purchase'
 import {
   getPurchaseList, createPurchase, getPurchaseDetail,
-  approvePurchase, batchApprovePurchase, getPurchaseApprovers, autoFillPurchase
+  approvePurchase, batchApprovePurchase, getPurchaseApprovers, autoFillPurchase,
+  getPurchaseByBatch
 } from '@/api/purchase'
 import { uploadFile, deleteFile } from '@/api/common/upload'
 import type { FormInstance } from 'element-plus'
@@ -408,6 +454,50 @@ const confirmBatchReject = async () => {
 const detailDialogVisible = ref(false)
 const detail = ref<any>({})
 
+// ★ 整批查看
+const batchDialogVisible = ref(false)
+const currentBatchNo = ref('')
+const batchItems = ref<any[]>([])
+
+// 打开整批查看弹窗
+const openBatchDialog = async (batchNo: string) => {
+  currentBatchNo.value = batchNo
+  batchItems.value = []
+  batchDialogVisible.value = true
+  try {
+    const res: any = await getPurchaseByBatch(batchNo)
+    batchItems.value = res.data?.items || []
+  } catch (err: any) {
+    ElMessage.error(err?.msg || '加载批次记录失败')
+  }
+}
+
+// 批量通过本批（按批次号）
+const handleBatchApproveByNo = async () => {
+  if (!currentBatchNo.value) return
+  const pendingCount = batchItems.value.filter(i => i.status === 0).length
+  if (pendingCount === 0) return ElMessage.warning('本批没有待审批记录')
+  try {
+    await ElMessageBox.confirm(
+      `确定批量通过本批 ${pendingCount} 条采购申请吗？`,
+      '批量审批确认',
+      { confirmButtonText: '批量通过', cancelButtonText: '取消', type: 'info' }
+    )
+  } catch { return }
+
+  batchLoading.value = true
+  try {
+    const res: any = await batchApprovePurchase({ batch_no: currentBatchNo.value, action: 'approve' })
+    ElMessage.success(res?.msg || '本批已全部通过')
+    await openBatchDialog(currentBatchNo.value)  // 刷新整批数据
+    await fetchData()
+  } catch (err: any) {
+    ElMessage.error(err?.msg || '批量通过失败')
+  } finally {
+    batchLoading.value = false
+  }
+}
+
 // 创建弹窗
 const formDialogVisible = ref(false)
 const dialogTitle = ref('新建采购申请')
@@ -804,6 +894,16 @@ const syncRemarkToAll = () => {
   ElMessage.success('已将第一行备注同步到所有行')
 }
 
+// ★ 生成采购批次号（与后端 generate_batch_no 格式一致）
+const generateBatchNo = () => {
+  const now = new Date()
+  const pad = (n: number) => String(n).padStart(2, '0')
+  const dateStr = `${now.getFullYear()}${pad(now.getMonth() + 1)}${pad(now.getDate())}`
+  const timeStr = `${pad(now.getHours())}${pad(now.getMinutes())}`
+  const rand = Math.random().toString(16).slice(2, 6).toUpperCase()
+  return `BATCH-${dateStr}-${timeStr}-${rand}`
+}
+
 // ★ 照片一键同步所有行：取第一行的照片深拷贝到所有行
 const syncImagesToAll = () => {
   if (formItems.value.length <= 1) {
@@ -852,12 +952,15 @@ const submitForm = async () => {
     }
   }
 
-  // 3. 逐行提交（每行携带公共信息）
+  // 3. 逐行提交（每行携带公共信息 + 同一批次号）
   submitLoading.value = true
   let successCount = 0
+  // ★ 生成批次号：同一批提交的所有记录共享，便于审批端按批次查看/统计
+  const batchNo = generateBatchNo()
   try {
     for (const row of validItems) {
       const payload: any = {
+        batch_no: batchNo,
         name: row.name,
         spec_model: row.spec_model,
         quantity: row.quantity,