feat: 增强差旅报销审核流程与票据智能推理

优化本体解析和编排器的差旅场景处理能力，完善报销单草稿
保存和费用明细同步逻辑，前端报销创建页面增加行程推理和
票据审核交互，新增助手会话快照工具函数，补充单元测试。

server/tests/test_user_agent_service.py

@@ -496,25 +496,18 @@ def test_user_agent_guides_generic_expense_request() -> None:
             )
         )
 
-        assert response.review_payload is not None
-        assert response.answer == response.review_payload.body_message
-        assert response.review_payload.can_proceed is False
-        assert response.review_payload.missing_slots == [
-            "报销类型",
-            "发生时间",
-            "金额",
-            "事由说明",
-            "票据附件",
-        ]
-        assert [item.action_type for item in response.review_payload.confirmation_actions] == [
-            "cancel_review",
-            "edit_review",
+        assert response.review_payload is None
+        assert response.draft_payload is None
+        assert "请先在下面选择报销场景" in response.answer
+        assert [item.action_type for item in response.suggested_actions] == [
+            "select_expense_type",
+            "select_expense_type",
+            "select_expense_type",
+            "select_expense_type",
+            "select_expense_type",
+            "select_expense_type",
         ]
-        edit_action = next(
-            item for item in response.review_payload.confirmation_actions if item.action_type == "edit_review"
-        )
-        assert edit_action.label == "选择报销类型"
-        assert edit_action.emphasis == "primary"
+        assert [item.label for item in response.suggested_actions[:3]] == ["差旅费", "交通费", "住宿费"]
 
 
 def test_user_agent_asks_for_type_when_trip_context_is_ambiguous() -> None:
@@ -537,25 +530,69 @@ def test_user_agent_asks_for_type_when_trip_context_is_ambiguous() -> None:
             )
         )
 
+        assert response.review_payload is None
+        assert response.draft_payload is None
+        assert "请先在下面选择报销场景" in response.answer
+        assert "避免系统先入为主" in response.answer
+        assert [item.label for item in response.suggested_actions] == [
+            "差旅费",
+            "交通费",
+            "住宿费",
+            "业务招待费",
+            "办公费",
+            "其他费用",
+        ]
+        assert response.suggested_actions[0].payload["original_message"] == message
+
+
+def test_user_agent_continues_identification_after_expense_type_selection() -> None:
+    session_factory = build_session_factory()
+    with session_factory() as db:
+        message = "业务发生时间:2026-02-20 至 2026-02-23，去上海支持上海电力部署项目，申请报销"
+        ontology = SemanticOntologyService(db).parse(
+            OntologyParseRequest(
+                query=f"{message}\n用户选择报销场景：差旅费",
+                user_id="pytest-selected-type@example.com",
+                context_json={
+                    "expense_scene_selection": {
+                        "expense_type": "travel",
+                        "expense_type_label": "差旅费",
+                        "original_message": message,
+                    },
+                    "review_form_values": {
+                        "expense_type": "差旅费",
+                    },
+                    "user_input_text": message,
+                },
+            )
+        )
+        response = UserAgentService(db).respond(
+            UserAgentRequest(
+                run_id=ontology.run_id,
+                user_id="pytest-selected-type@example.com",
+                message=f"{message}\n用户选择报销场景：差旅费",
+                ontology=ontology,
+                context_json={
+                    "expense_scene_selection": {
+                        "expense_type": "travel",
+                        "expense_type_label": "差旅费",
+                        "original_message": message,
+                    },
+                    "review_form_values": {
+                        "expense_type": "差旅费",
+                    },
+                    "user_input_text": message,
+                },
+                tool_payload={"draft_only": True},
+            )
+        )
+
         assert response.review_payload is not None
         slot_map = {item.key: item for item in response.review_payload.slot_cards}
-        assert slot_map["expense_type"].value == ""
-        assert slot_map["expense_type"].status == "missing"
+        assert slot_map["expense_type"].value == "差旅费"
+        assert slot_map["expense_type"].normalized_value == "travel"
         assert slot_map["time_range"].value == "2026-02-20 至 2026-02-23"
         assert slot_map["location"].value == "上海"
-        assert response.review_payload.can_proceed is False
-        assert "报销类型" in response.review_payload.missing_slots
-        assert "选择报销类型" in response.review_payload.body_message
-        assert "不会重新改判报销类型" in response.review_payload.body_message
-        edit_action = next(
-            item for item in response.review_payload.confirmation_actions if item.action_type == "edit_review"
-        )
-        assert edit_action.label == "选择报销类型"
-        assert edit_action.emphasis == "primary"
-        assert [item.action_type for item in response.review_payload.confirmation_actions] == [
-            "cancel_review",
-            "edit_review",
-        ]
 
 
 def test_user_agent_guides_implicit_expense_draft_request() -> None: