feat: 物料页面接入批量导入与模板下载

- 顶部加「下载模板」「批量导入」两个按钮和隐藏的 xlsx 文件输入
- 上传走保存互斥，飞行期间禁止切换公司；importing 标志挡住重复选文件
- 发起请求前清空 input.value，否则连续选同一个文件不会再触发 change
- 校验失败（400 且 data 带 errors）弹结果弹窗，其余错误走兜底提示
- 成功后刷新到第一页并提示导入条数

测试里挂载后先把 fetchMaterials mockClear 掉：onMounted 已经拉过一次列表，
不清空的话「未被调用」必然失败、成功用例的断言也没有区分度；成功那条改成断言
具体的 (1, '', 'all') 参数。

frontend/src/views/Materials.test.js

@@ -20,6 +20,11 @@ const materialsStore = vi.hoisted(() => ({
   getCategoryDisplay: vi.fn(() => '-')
 }))
 
+const materialsApi = vi.hoisted(() => ({
+  importFile: vi.fn(),
+  downloadImportTemplate: vi.fn()
+}))
+
 vi.mock('../stores/materials', () => ({ useMaterialsStore: () => materialsStore }))
 vi.mock('../stores/auth', () => ({ useAuthStore: () => ({ isAdmin: true }) }))
 // 切换公司的未保存确认由组织 store 承载；这里只关心页面本身，替身掉守卫注册。
@@ -42,6 +47,7 @@ vi.mock('../api/masterData', () => ({
   unitsApi: { list: vi.fn() },
   codeRulesApi: { next: vi.fn() }
 }))
+vi.mock('../api/materials', () => ({ materialsApi }))
 
 // 真实的 ElSelect 在 jsdom 下会因自身更新报 "Maximum recursive updates exceeded"，
 // 这里用替身直接派发 change，模拟用户选中某个分类。
@@ -607,3 +613,61 @@ describe('物料图片上传的保存互斥', () => {
     wrapper.unmount()
   })
 })
+
+describe('批量导入', () => {
+  beforeEach(() => {
+    materialsApi.importFile.mockReset()
+    materialsApi.downloadImportTemplate.mockReset()
+    materialsStore.fetchMaterials.mockReset()
+    vi.spyOn(ElMessage, 'success').mockImplementation(() => {})
+  })
+
+  test('批量导入成功后提示成功并刷新列表', async () => {
+    materialsApi.importFile.mockResolvedValue({
+      data: { total_rows: 2, success_rows: 2, failed_rows: 0, errors: [] }
+    })
+
+    const wrapper = mountMaterials()
+    await flushPromises()
+    // 挂载时 onMounted 已经拉过一次列表，清掉才能断言“导入后又拉了一次”
+    materialsStore.fetchMaterials.mockClear()
+
+    await setupState(wrapper).handleImportFile({
+      target: { files: [new File(['x'], '物料.xlsx')], value: '物料.xlsx' }
+    })
+    await flushPromises()
+
+    expect(materialsApi.importFile).toHaveBeenCalled()
+    expect(materialsStore.fetchMaterials).toHaveBeenCalledWith(1, '', 'all')
+    expect(ElMessage.success).toHaveBeenCalledWith('成功导入 2 条物料')
+    wrapper.unmount()
+  })
+
+  test('批量导入失败时展示错误明细且不刷新列表', async () => {
+    const error = new Error('校验未通过')
+    error.response = {
+      data: {
+        code: 400,
+        message: '有 1 行校验未通过，本次未导入任何数据',
+        data: {
+          total_rows: 1, success_rows: 0, failed_rows: 1,
+          errors: [{ row: 2, data: { name: '', spec: '', unit: '', major: '', minor: '' }, reason: '物料名称不能为空' }]
+        }
+      }
+    }
+    materialsApi.importFile.mockRejectedValue(error)
+
+    const wrapper = mountMaterials()
+    await flushPromises()
+    materialsStore.fetchMaterials.mockClear()
+
+    await setupState(wrapper).handleImportFile({
+      target: { files: [new File(['x'], '物料.xlsx')], value: '物料.xlsx' }
+    })
+    await flushPromises()
+
+    expect(setupState(wrapper).importResult.failed_rows).toBe(1)
+    expect(materialsStore.fetchMaterials).not.toHaveBeenCalled()
+    wrapper.unmount()
+  })
+})

frontend/src/views/Materials.vue

@@ -2,7 +2,18 @@
   <div class="materials-page">
     <div class="page-header">
       <h2>物料主数据</h2>
+      <div class="header-actions">
+        <el-button @click="handleDownloadTemplate">下载模板</el-button>
+        <el-button @click="triggerImport">批量导入</el-button>
         <el-button type="primary" @click="showAddModal">新增物料</el-button>
+        <input
+          ref="importInput"
+          type="file"
+          accept=".xlsx"
+          style="display: none"
+          @change="handleImportFile"
+        />
+      </div>
     </div>
 
     <div class="search-bar">
@@ -162,6 +173,10 @@
       :on-confirm="confirmDelete"
     />
 
+    <el-dialog v-model="importDialogVisible" title="批量导入结果" width="900px" @closed="handleImportDialogClosed">
+      <MaterialImportResult v-if="importResult" :result="importResult" @close="importDialogVisible = false" />
+    </el-dialog>
+
     <AlertTip :message="alertMessage" :type="alertType" />
   </div>
 </template>
@@ -175,9 +190,11 @@ import { useSavingGuard } from '../composables/useSavingGuard'
 import BaseTable from '../components/business/BaseTable.vue'
 import DeleteConfirm from '../components/business/DeleteConfirm.vue'
 import AlertTip from '../components/business/AlertTip.vue'
+import MaterialImportResult from '../components/business/MaterialImportResult.vue'
 import { ElMessage, ElMessageBox } from 'element-plus'
 import { createMaterialForm, toMaterialPayload } from './materialForm'
 import { codeRulesApi, materialCategoriesApi, unitsApi } from '../api/masterData'
+import { materialsApi } from '../api/materials'
 import { getMajorCategories, getMinorCategories, resolveCategoryPath } from '../utils/materialCategories'
 import { searchMaterialOptions } from '../utils/materialSearch'
 import { errorText } from '../utils/errorText'
@@ -212,6 +229,10 @@ const alertMessage = ref('')
 const alertType = ref('success')
 const imagePreview = ref('')
 const imageInput = ref(null)
+const importInput = ref(null)
+const importDialogVisible = ref(false)
+const importResult = ref(null)
+const importing = ref(false)
 const categories = ref([])
 const units = ref([])
 // 用户是否手改过编码：没改过时切分类要按新规则重算，改过就以用户的值为准。
@@ -253,6 +274,78 @@ function handleImageUpload(e) {
   }
 }
 
+// 批量导入入口：上传期间再点不该重新弹选择框
+function triggerImport() {
+  if (importing.value) return
+  importInput.value?.click()
+}
+
+async function handleImportFile(event) {
+  const file = event.target.files?.[0]
+  // 清空 input，否则连续选同一个文件不会再触发 change
+  event.target.value = ''
+  if (!file) return
+  if (!file.name.toLowerCase().endsWith('.xlsx')) {
+    ElMessage.warning('只支持 .xlsx 文件')
+    return
+  }
+  if (file.size > 5 * 1024 * 1024) {
+    ElMessage.warning('文件不能超过 5MB')
+    return
+  }
+
+  const formData = new FormData()
+  formData.append('file', file)
+
+  importing.value = true
+  try {
+    // 导入是写请求：包进保存互斥，飞行期间禁止切换公司
+    const res = await runWithSaving(() => materialsApi.importFile(formData))
+    const result = res.data
+    await materialsStore.fetchMaterials(1, '', 'all')
+    searchKeyword.value = ''
+    ElMessage.success(`成功导入 ${result.success_rows} 条物料`)
+  } catch (e) {
+    // 校验失败时响应里带逐行明细，弹窗展示；其余错误走兜底提示
+    const detail = e?.response?.data?.data
+    if (detail && Array.isArray(detail.errors)) {
+      importResult.value = detail
+      importDialogVisible.value = true
+    } else if (!e?.response) {
+      console.error('批量导入失败:', e)
+      ElMessage.error(errorText(e, '批量导入失败'))
+    }
+  } finally {
+    importing.value = false
+  }
+}
+
+function handleImportDialogClosed() {
+  importResult.value = null
+}
+
+async function handleDownloadTemplate() {
+  try {
+    const res = await runWithSaving(() => materialsApi.downloadImportTemplate())
+    if (!res.ok) {
+      ElMessage.error('模板下载失败')
+      return
+    }
+    const blob = await res.blob()
+    const url = URL.createObjectURL(blob)
+    const link = document.createElement('a')
+    link.href = url
+    link.download = '物料导入模板.xlsx'
+    document.body.appendChild(link)
+    link.click()
+    document.body.removeChild(link)
+    URL.revokeObjectURL(url)
+  } catch (e) {
+    console.error('下载模板失败:', e)
+    ElMessage.error('模板下载失败')
+  }
+}
+
 const form = reactive(createMaterialForm())
 
 onMounted(async () => {
@@ -507,6 +600,10 @@ useOrganizationSwitchGuard(() => hasUnsavedChanges.value)
   align-items: center;
   margin-bottom: 20px;
 }
+.header-actions {
+  display: flex;
+  gap: 8px;
+}
 .search-bar {
   display: flex;
   width: 100%;