feat: Excel导入支持自定义列映射+智能列名检测

- 上传后自动读取Excel列名，下拉框选择映射
- 智能匹配: 科目/编码→kpi_code, 期间→period, 金额→actual_value
- 支持统一期间(文件无期间列时)
- 后端接受 kpi_col/period_col/value_col/default_period 参数

frontend/src/views/DataManage.vue

@@ -14,6 +14,41 @@
           <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>
+
+          <!-- 列映射设置 -->
+          <el-card v-if="files.length > 0" style="margin-top:12px;" size="small">
+            <template #header>📐 列映射设置（如Excel列名与标准不同，请在此映射）</template>
+            <el-form :model="colMap" label-width="120px" size="small">
+              <el-row :gutter="16">
+                <el-col :span="8">
+                  <el-form-item label="KPI编码列">
+                    <el-select v-model="colMap.kpi" allow-create filterable clearable placeholder="kpi_code">
+                      <el-option v-for="c in detectedCols" :key="c" :label="c" :value="c" />
+                    </el-select>
+                  </el-form-item>
+                </el-col>
+                <el-col :span="8">
+                  <el-form-item label="期间列（可选）">
+                    <el-select v-model="colMap.period" allow-create filterable clearable placeholder="period">
+                      <el-option v-for="c in detectedCols" :key="c" :label="c" :value="c" />
+                      <el-option label="（统一设置）" value="__fixed__" />
+                    </el-select>
+                  </el-form-item>
+                </el-col>
+                <el-col :span="8">
+                  <el-form-item label="数值列">
+                    <el-select v-model="colMap.value" allow-create filterable clearable placeholder="actual_value">
+                      <el-option v-for="c in detectedCols" :key="c" :label="c" :value="c" />
+                    </el-select>
+                  </el-form-item>
+                </el-col>
+              </el-row>
+              <el-form-item v-if="colMap.period === '__fixed__'" label="统一期间">
+                <el-input v-model="colMap.defaultPeriod" placeholder="如 2026-06" style="width:200px;" />
+              </el-form-item>
+            </el-form>
+          </el-card>
+
           <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>
@@ -100,11 +135,14 @@ const activeTab = ref('import')
 const files = ref<any[]>([])
 const uploading = ref(false)
 const result = ref('')
+const detectedCols = ref<string[]>([])
+const colMap = ref({ kpi: 'kpi_code', period: 'period', value: 'actual_value', defaultPeriod: '' })
 
 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)
+    // 从第一个文件检测列名
+    if (files.value.length === 1) detectColumns(f.raw)
   }
 }
 function handleRemove(f: any) {
@@ -113,14 +151,42 @@ function handleRemove(f: any) {
 function removeFile(i: number) {
   files.value.splice(i, 1)
 }
+async function detectColumns(file: File) {
+  // 用 Web 方式读 Excel 列名（仅第一行），供用户映射
+  try {
+    const buf = await file.arrayBuffer()
+    const XLSX = (await import('xlsx')).default
+    const wb = XLSX.read(buf, { type: 'array' })
+    const ws = wb.Sheets[wb.SheetNames[0]]
+    const rows: any[] = XLSX.utils.sheet_to_json(ws, { header: 1 })
+    if (rows.length > 0) {
+      detectedCols.value = (rows[0] as string[]).filter(Boolean)
+      // 尝试智能匹配
+      const all = detectedCols.value.map(c => c.toLowerCase().replace(/[\\s　]/g, ''))
+      const kpiIdx = all.findIndex(c => /^(kpi_?code|编码|科目|项目|指标名称?)$/.test(c))
+      const periodIdx = all.findIndex(c => /^(period|期间|月份?|日期|年月)$/.test(c))
+      const valIdx = all.findIndex(c => /^(actual_?value|金额|数值|本月数|本期金额?|实际值)$/.test(c))
+      if (kpiIdx >= 0) colMap.value.kpi = detectedCols.value[kpiIdx]
+      if (periodIdx >= 0) colMap.value.period = detectedCols.value[periodIdx]
+      if (valIdx >= 0) colMap.value.value = detectedCols.value[valIdx]
+    }
+  } catch (_) { /* 预览列名失败不影响导入 */ }
+}
 async function doImport() {
   if (files.value.length === 0) return
   uploading.value = true
   result.value = ''
   const msgs: string[] = []
+  const params: Record<string, string> = {
+    kpi_col: colMap.value.kpi || 'kpi_code',
+    value_col: colMap.value.value || 'actual_value',
+  }
+  if (colMap.value.period && colMap.value.period !== '__fixed__') params['period_col'] = colMap.value.period
+  if (colMap.value.period === '__fixed__' && colMap.value.defaultPeriod) params['default_period'] = colMap.value.defaultPeriod
+  const qs = new URLSearchParams(params).toString()
   for (const f of files.value) {
     try {
-      const r: any = await dataApi.importExcel(f)
+      const r: any = await dataApi.importExcel(f, qs)
       const skipped = r.skipped || 0
       const total = r.total || 0
       msgs.push(`📄 ${f.name}: ${total}条导入${skipped > 0 ? `, ${skipped}条跳过` : ''}`)
@@ -129,6 +195,7 @@ async function doImport() {
     }
   }
   files.value = []
+  detectedCols.value = []
   result.value = msgs.join('\n')
   uploading.value = false
 }