feat: 报告生成扩展 PPT/Word/Excel 多格式导出

- 新增 ExportReportDOCX 导出 Word 文档（纯标准库）
- 新增 ExportReportPPTX 导出 PPT 演示文稿（纯标准库）
- 新增 ExportReportXLSX 导出 Excel 表格（纯标准库）
- 新增 /api/report/export/{docx,pptx,xlsx} 路由
- 前端增加多格式导出下拉菜单（PDF/Word/PPT/Excel）
- 前端导出函数按格式名提示成功信息
- 零网络依赖，纯 Go 标准库实现

eai_ap_app/frontend/src/api/report.js

@@ -8,6 +8,18 @@ export function exportReportPDF(data) {
   return http.post('/report/export/pdf', data, { responseType: 'blob' })
 }
 
+export function exportReportDOCX(data) {
+  return http.post('/report/export/docx', data, { responseType: 'blob' })
+}
+
+export function exportReportPPTX(data) {
+  return http.post('/report/export/pptx', data, { responseType: 'blob' })
+}
+
+export function exportReportXLSX(data) {
+  return http.post('/report/export/xlsx', data, { responseType: 'blob' })
+}
+
 export function previewReport(data) {
   return http.post('/report/preview', data)
 }

eai_ap_app/frontend/src/views/report/ReportGenerationPage.vue

@@ -97,10 +97,20 @@
               </span>
             </div>
             <div class="card-actions" v-if="reportContent">
-              <el-button size="small" :loading="exporting" @click="exportToPDF">
-                <el-icon><Download /></el-icon>
-                导出 PDF
-              </el-button>
+              <el-dropdown trigger="click" @command="exportReport">
+                <el-button size="small" :loading="exporting">
+                  <el-icon><Download /></el-icon>
+                  导出 <el-icon><ArrowDown /></el-icon>
+                </el-button>
+                <template #dropdown>
+                  <el-dropdown-menu>
+                    <el-dropdown-item command="pdf"><el-icon><Document /></el-icon> PDF 文档</el-dropdown-item>
+                    <el-dropdown-item command="docx"><el-icon><Reading /></el-icon> Word 文档</el-dropdown-item>
+                    <el-dropdown-item command="pptx"><el-icon><Grid /></el-icon> PPT 演示文稿</el-dropdown-item>
+                    <el-dropdown-item command="xlsx"><el-icon><Reading /></el-icon> Excel 表格</el-dropdown-item>
+                  </el-dropdown-menu>
+                </template>
+              </el-dropdown>
               <el-button size="small" @click="resetReport">
                 清除
               </el-button>
@@ -148,8 +158,8 @@
 <script setup>
 import { onMounted, ref } from 'vue'
 import { ElMessage } from 'element-plus'
-import { Edit, Download } from '@element-plus/icons-vue'
-import { generateReport, exportReportPDF } from '@/api/report'
+import { Edit, Download, Document, Reading, ArrowDown, Grid } from '@element-plus/icons-vue'
+import { generateReport as apiGenerateReport, exportReportPDF, exportReportDOCX, exportReportPPTX, exportReportXLSX } from '@/api/report'
 import { listKnowledgeSpaces } from '@/api/knowledge'
 
 const generating = ref(false)
@@ -173,7 +183,7 @@ async function generateReport() {
 
   generating.value = true
   try {
-    const res = await generateReport({
+    const res = await apiGenerateReport({
       topic: form.value.topic.trim(),
       summary: form.value.summary,
       sections: form.value.sections,
@@ -197,28 +207,44 @@ async function generateReport() {
   }
 }
 
-async function exportToPDF() {
+async function exportReport(command) {
   if (!reportContent.value) return
 
   exporting.value = true
   try {
-    const blob = await exportReportPDF({
-      report: reportContent.value,
-    })
-
-    // 下载 PDF
+    const formatNames = { pdf: 'PDF', docx: 'Word', pptx: 'PPT', xlsx: 'Excel' }
+    const exts = { pdf: '.pdf', docx: '.docx', pptx: '.pptx', xlsx: '.xlsx' }
+    const formatName = formatNames[command] || '文件'
+    const ext = exts[command] || '.pdf'
+    let blob
+    switch (command) {
+      case 'pdf':
+        blob = await exportReportPDF({ report: reportContent.value })
+        break
+      case 'docx':
+        blob = await exportReportDOCX({ report: reportContent.value })
+        break
+      case 'pptx':
+        blob = await exportReportPPTX({ report: reportContent.value })
+        break
+      case 'xlsx':
+        blob = await exportReportXLSX({ report: reportContent.value })
+        break
+      default:
+        return
+    }
     const url = URL.createObjectURL(blob)
     const a = document.createElement('a')
     a.href = url
-    const filename = (reportContent.value.topic || 'report') + '.pdf'
-    a.download = filename.replace(/[^a-zA-Z一-龥　-￿]/g, '_')
+    const filename = (reportContent.value.topic || 'report') + ext
+    a.download = filename.replace(/[^a-zA-Z一-龥龥　-￿]/g, '_')
     document.body.appendChild(a)
     a.click()
     document.body.removeChild(a)
     URL.revokeObjectURL(url)
-    ElMessage.success('PDF 已下载')
+    ElMessage.success(`${formatName} 已下载`)
   } catch (error) {
-    ElMessage.error('PDF 导出失败')
+    ElMessage.error(`${formatName} 导出失败`)
   } finally {
     exporting.value = false
   }