refactor: 下沉 Word 导出执行链到 chat 服务层

tests/test_chat.py

@@ -8,7 +8,11 @@ from agent_core.results import AgentResult
 from apps.audit.models import AgentAuditLog
 from apps.audit.models import NotificationRecord
 from apps.chat.models import Conversation
-from apps.chat.services import create_conversation_for_batch, execute_conversation_agent
+from apps.chat.services import (
+    create_conversation_for_batch,
+    execute_conversation_agent,
+    execute_conversation_export,
+)
 from apps.documents.models import ExportedDocument, SubmissionBatch, UploadedDocument
 
 
@@ -412,6 +416,41 @@ def test_execute_conversation_agent_runs_in_service_layer_and_persists_audit_and
     assert record.web_detail_url == f"/audit/{audit_log.id}/"
 
 
+def test_execute_conversation_export_runs_in_service_layer_and_persists_audit(db, monkeypatch):
+    batch, conversation = _create_conversation_with_batch()
+    captured = {}
+
+    def fake_generate_registration_export(*, batch, conversation, upstream_summary=None):
+        captured["batch_id"] = batch.batch_id
+        captured["conversation_id"] = conversation.conversation_id
+        captured["upstream_summary"] = upstream_summary or {}
+        return {
+            "output_type": "registration_word_export_report",
+            "summary": "已生成草稿导出文件。",
+            "template_name": "注册证导出模板",
+            "template_version": "V1.0",
+            "export_status": "draft_only",
+            "download_url": "/media/exports/demo.docx",
+            "output_file": {
+                "file_name": "demo.docx",
+                "relative_path": "exports/demo.docx",
+                "export_mode": "draft",
+            },
+        }
+
+    monkeypatch.setattr("apps.chat.export_service.generate_registration_export", fake_generate_registration_export)
+
+    result = execute_conversation_export(batch=batch, conversation=conversation)
+
+    conversation.refresh_from_db()
+    assert captured["batch_id"] == batch.batch_id
+    assert captured["conversation_id"] == conversation.conversation_id
+    assert result["export_report"]["output_type"] == "registration_word_export_report"
+    assert result["audit_log"].scenario_name == "Word 回填导出"
+    assert conversation.latest_summary["structured_output"]["download_url"] == "/media/exports/demo.docx"
+    assert AgentAuditLog.objects.filter(conversation_id=conversation.conversation_id).count() == 1
+
+
 def test_chat_page_shows_upload_entry_and_dynamic_context_cards(client, db):
     batch, conversation = _create_conversation_with_batch()
     conversation.node_results = [