feat: 招商银行 PDF 账单导入、跨格式去重与导入性能优化

- 新增招商银行「交易流水」PDF 解析（PDFBox 坐标还原，支持多页与折行），CSV/PDF 去重标识统一，支持跨格式去重
- 账单导入改为批量插入，MyBatis 日志改 Slf4j，导入接口超时放宽至 120s
- 交易导出 Excel 增加样式、冻结表头与自动筛选，导出前二次确认
- 交易列表展示不计入统计金额，导入预览支持设置「计入统计」

frontend/src/views/TransactionList.vue

@@ -76,6 +76,18 @@ const pageSummary = computed(() => {
   }
   return { income, expense, balance: income - expense }
 })
+// 当前页不计入统计的金额汇总（仅统计 includeInStats=false 的记录）
+const pageExcludedSummary = computed(() => {
+  let income = 0
+  let expense = 0
+  for (const t of transactions.value) {
+    if (t.includeInStats) continue
+    const amount = Number(t.amount) || 0
+    if (t.type === 'INCOME') income += amount
+    else expense += amount
+  }
+  return { income, expense }
+})
 const loading = ref(false) // 列表加载状态
 const showModal = ref(false) // 新增/编辑弹窗显示状态
 const showImportModal = ref(false) // 账单导入弹窗显示状态
@@ -1555,8 +1567,23 @@ async function handleBatchSubmit() {
   }
 }
 
-/** 导出交易记录为 Excel 文件 */
-async function handleExport() {
+/** 导出中状态，防止重复点击 */
+const exporting = ref(false)
+
+/** 导出交易记录：弹出二次确认，确认后执行导出 */
+function handleExport() {
+  dialog.warning({
+    title: t('transaction.exportConfirmTitle'),
+    content: t('transaction.exportConfirm'),
+    positiveText: t('common.confirm'),
+    negativeText: t('common.cancel'),
+    onPositiveClick: () => doExport(),
+  })
+}
+
+/** 实际执行导出交易记录为 Excel 文件 */
+async function doExport() {
+  exporting.value = true
   try {
     const res = await exportTransaction({
       types: filterType.value.length > 0 ? filterType.value : undefined,
@@ -1584,6 +1611,8 @@ async function handleExport() {
     message.success(t('transaction.exportSuccess'))
   } catch (e: any) {
     message.error(e.message || t('transaction.exportFailed'))
+  } finally {
+    exporting.value = false
   }
 }
 
@@ -1614,7 +1643,7 @@ onMounted(() => {
           {{ t('transaction.batchDelete') }}
         </NButton>
         <NButton @click="showImportModal = true">{{ t('transaction.importBill') }}</NButton>
-        <NButton @click="handleExport">{{ t('transaction.exportExcel') }}</NButton>
+        <NButton :loading="exporting" @click="handleExport">{{ t('transaction.exportExcel') }}</NButton>
         <NButton v-if="aiEnabled" @click="handleAiRecordOpen">
           <template #icon>
             <NIcon :component="SparklesOutline" />
@@ -1802,6 +1831,9 @@ onMounted(() => {
         {{ t('transaction.pageExpense') }} <span style="color: #d03050;">{{ pageSummary.expense.toFixed(2) }}</span>
         · {{ t('transaction.pageIncome') }} <span style="color: #18a058;">{{ pageSummary.income.toFixed(2) }}</span>
         · {{ t('transaction.pageBalance') }} <span :style="{ color: pageSummary.balance < 0 ? '#d03050' : '#18a058' }">{{ pageSummary.balance.toFixed(2) }}</span>
+        <span style="margin-left: 8px;">
+          {{ t('transaction.pageExcluded', { expense: pageExcludedSummary.expense.toFixed(2), income: pageExcludedSummary.income.toFixed(2) }) }}
+        </span>
       </span>
     </NSpace>