feat: Excel导入支持多文件选择(Ctrl/Shift多选)+逐文件结果展示

frontend/src/views/DataManage.vue

@@ -6,12 +6,15 @@
       <el-tab-pane label="Excel导入" name="import">
         <el-card>
           <template #header>Excel导入</template>
-          <el-upload drag :auto-upload="false" :on-change="handleFile" accept=".xlsx,.xls" :limit="1">
+          <el-upload drag :auto-upload="false" :on-change="handleFile" :on-remove="handleRemove" multiple accept=".xlsx,.xls">
             <el-icon :size="32"><UploadFilled /></el-icon>
             <div>拖拽或点击上传Excel文件</div>
-            <div style="color:#999;font-size:12px;">支持 .xlsx .xls，需包含 kpi_code, period, actual_value 三列</div>
+            <div style="color:#999;font-size:12px;">支持 .xlsx .xls，可一次选择多个文件（按住Ctrl/Shift多选）</div>
           </el-upload>
-          <el-button v-if="file" type="primary" style="margin-top:12px;" :loading="uploading" @click="doImport">导入数据</el-button>
+          <div v-if="files.length > 0" style="margin-top:8px;">
+            <el-tag v-for="(f, i) in files" :key="i" closable @close="removeFile(i)" style="margin:2px;">{{ f.name }}</el-tag>
+          </div>
+          <el-button v-if="files.length > 0" type="primary" style="margin-top:12px;" :loading="uploading" @click="doImport">导入 {{ files.length }} 个文件</el-button>
           <div v-if="result" style="margin-top:12px;"><el-alert :title="result" type="success" show-icon /></div>
         </el-card>
       </el-tab-pane>
@@ -94,18 +97,39 @@ import MyDialog from '../components/MyDialog.vue'
 const activeTab = ref('import')
 
 // === Excel导入 ===
-const file = ref<any>(null)
+const files = ref<any[]>([])
 const uploading = ref(false)
 const result = ref('')
-function handleFile(f: any) { file.value = f.raw }
+
+function handleFile(f: any) {
+  // el-upload multiple 模式下每次 onChange 传单个文件
+  if (f.raw && !files.value.some(ex => ex.name === f.raw.name && ex.size === f.raw.size)) {
+    files.value.push(f.raw)
+  }
+}
+function handleRemove(f: any) {
+  files.value = files.value.filter(ex => !(ex.name === f.name && ex.size === f.size))
+}
+function removeFile(i: number) {
+  files.value.splice(i, 1)
+}
 async function doImport() {
-  if (!file.value) return
+  if (files.value.length === 0) return
   uploading.value = true
-  try {
-    const r: any = await dataApi.importExcel(file.value)
-    result.value = r.message || '导入成功'
-    file.value = null
-  } catch (e) { ElMessage.error('导入失败') }
+  result.value = ''
+  const msgs: string[] = []
+  for (const f of files.value) {
+    try {
+      const r: any = await dataApi.importExcel(f)
+      const skipped = r.skipped || 0
+      const total = r.total || 0
+      msgs.push(`📄 ${f.name}: ${total}条导入${skipped > 0 ? `, ${skipped}条跳过` : ''}`)
+    } catch (e: any) {
+      msgs.push(`❌ ${f.name}: ${e?.response?.data?.detail || '导入失败'}`)
+    }
+  }
+  files.value = []
+  result.value = msgs.join('\n')
   uploading.value = false
 }