feat(file-summary): 生成汇总报告和导出下载

tests/test_file_summary_report.py

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+from pathlib import Path
+import pytest
+from openpyxl import load_workbook
+
+from review_agent.file_summary.services.export_excel import generate_excel_export
+from review_agent.file_summary.services.report import generate_markdown_report
+from review_agent.models import Conversation, FileSummaryBatch, FileSummaryItem, Message
+
+
+pytestmark = pytest.mark.django_db
+
+
+def make_batch(tmp_path, django_user_model):
+    user = django_user_model.objects.create_user(username="owner", password="pass")
+    conversation = Conversation.objects.create(user=user, title="会话")
+    batch = FileSummaryBatch.objects.create(
+        conversation=conversation,
+        user=user,
+        batch_no="FS-R",
+        work_dir=str(tmp_path),
+        total_files=1,
+        success_files=1,
+        total_pages=2,
+    )
+    FileSummaryItem.objects.create(
+        batch=batch,
+        file_index=1,
+        file_name="a.xlsx",
+        file_type="xlsx",
+        relative_path="a.xlsx",
+        storage_path=str(tmp_path / "a.xlsx"),
+        page_count=2,
+        statistics_status=FileSummaryItem.StatisticsStatus.SUCCESS,
+    )
+    return batch
+
+
+def test_generate_markdown_report_creates_export_and_summary(tmp_path, django_user_model):
+    batch = make_batch(tmp_path, django_user_model)
+
+    exported, summary = generate_markdown_report(batch)
+
+    assert exported.export_type == "markdown"
+    assert Path(exported.storage_path).exists()
+    assert "| 序号 | 目录层级 | 文件名 | 类型 | 页数 | 状态 | 异常说明 |" in summary
+    assert "a.xlsx" in Path(exported.storage_path).read_text(encoding="utf-8")
+
+
+def test_generate_excel_export_contains_summary_and_items(tmp_path, django_user_model):
+    batch = make_batch(tmp_path, django_user_model)
+
+    exported = generate_excel_export(batch)
+
+    workbook = load_workbook(exported.storage_path)
+    assert workbook.sheetnames == ["汇总信息", "文件明细"]
+    assert workbook["文件明细"]["C2"].value == "a.xlsx"
+
+
+def test_workflow_report_node_writes_assistant_message(tmp_path, settings, django_user_model):
+    from review_agent.file_summary.workflow import create_file_summary_batch, start_file_summary_workflow
+    from review_agent.models import FileAttachment
+
+    settings.MEDIA_ROOT = tmp_path
+    settings.FILE_SUMMARY_ASYNC = False
+    user = django_user_model.objects.create_user(username="owner", password="pass")
+    conversation = Conversation.objects.create(user=user, title="会话")
+    file_path = tmp_path / "a.xlsx"
+    file_path.write_bytes(b"not a real workbook")
+    FileAttachment.objects.create(
+        conversation=conversation,
+        user=user,
+        original_name="a.txt",
+        storage_path=str(file_path),
+        file_size=file_path.stat().st_size,
+    )
+    batch = create_file_summary_batch(conversation=conversation, user=user)
+    batch.work_dir = str(tmp_path / "batch")
+    batch.save(update_fields=["work_dir"])
+
+    start_file_summary_workflow(batch, async_run=False)
+
+    assert Message.objects.filter(conversation=conversation, role=Message.Role.ASSISTANT).exists()