feat: render question exports as assets

scripts/api-integration-test.js

@@ -2814,6 +2814,45 @@ async function testTenantContentAdmin() {
   const exportedQuestionWithAnswer = paperExport.export?.questions?.find(item => item.id === question.item.id);
   assert.equal(exportedQuestionWithAnswer?.answerText, '4', 'paper export should include answers when requested');
 
+  const pdfExportJob = await request('/api/tenant-content/exports/questions', {
+    userId: TENANT_ADMIN_USER_ID,
+    method: 'POST',
+    body: {
+      scopeType: 'collection',
+      scopeId: collection.item.id,
+      format: 'pdf',
+      exportType: 'paper',
+      includeAnswers: false,
+      includeExplanations: false,
+      options: {
+        title: '集成测试 PDF 异步导出',
+        watermarkText: '仅供内部测试',
+        publishToAssets: true,
+        assetVisibility: 'tenant',
+      },
+    },
+  });
+  assert.equal(pdfExportJob.job?.status, 'pending', 'PDF export should create a pending async export job');
+  assert.equal(pdfExportJob.export, null, 'PDF export should not return inline binary payload');
+
+  const docxExportJob = await request('/api/tenant-content/exports/questions', {
+    userId: TENANT_ADMIN_USER_ID,
+    method: 'POST',
+    body: {
+      scopeType: 'collection',
+      scopeId: collection.item.id,
+      format: 'docx',
+      exportType: 'paper',
+      includeAnswers: true,
+      includeExplanations: true,
+      options: {
+        title: '集成测试 Word 异步导出',
+        watermarkText: '仅供内部测试',
+      },
+    },
+  });
+  assert.equal(docxExportJob.job?.status, 'pending', 'DOCX export should create a pending async export job');
+
   const partnerExportDenied = await request('/api/tenant-content/exports/questions', {
     tenantId: PARTNER_TENANT_ID,
     userId: PARTNER_TENANT_ADMIN_USER_ID,
@@ -2831,6 +2870,10 @@ async function testTenantContentAdmin() {
     exportJobs.items?.some(item => item.id === exportNoAnswers.job.id && item.questionCount === 1),
     'question export jobs should list completed export audit records',
   );
+  const listedPdfJob = exportJobs.items?.find(item => item.id === pdfExportJob.job.id);
+  assert.equal(listedPdfJob?.status, 'pending', 'question export jobs should expose pending binary export jobs');
+  assert.equal(listedPdfJob?.assetId, null, 'pending binary export job should not have an asset yet');
+  assert.equal(listedPdfJob?.attemptCount, 0, 'pending binary export job should expose worker attempt count');
   const invalidExportJobsScope = await request('/api/tenant-content/exports/jobs', {
     userId: TENANT_ADMIN_USER_ID,
     query: { scopeType: 'not_supported' },