feat: 新增归档中心页面并完善知识库与报销查询能力

新增前端归档中心视图及相关工具函数，扩充知识库文档分类和
提取器支持多种格式，增强编排器报销查询的多维度检索，优
化本体规则和用户代理审核消息，前端完善报销创建和审批详
情交互细节，补充单元测试覆盖。

server/tests/test_user_agent_service.py

@@ -700,6 +700,37 @@ def test_user_agent_guides_riding_fare_as_transport_expense() -> None:
         assert "“交通费”" in response.review_payload.intent_summary
 
 
+def test_user_agent_keeps_taxi_ticket_for_customer_dropoff_as_transport_expense() -> None:
+    session_factory = build_session_factory()
+    with session_factory() as db:
+        message = "送客户去机场，报销的士票"
+        ontology = SemanticOntologyService(db).parse(
+            OntologyParseRequest(
+                query=message,
+                user_id="pytest",
+            )
+        )
+        response = UserAgentService(db).respond(
+            UserAgentRequest(
+                run_id=ontology.run_id,
+                user_id="pytest",
+                message=message,
+                ontology=ontology,
+                tool_payload={"draft_only": True},
+            )
+        )
+
+        assert ontology.intent == "draft"
+        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 == "交通费"
+        assert slot_map["expense_type"].normalized_value == "transport"
+        assert slot_map["reason"].value == "送客户去机场，报销的士票"
+        assert "业务招待费" not in response.review_payload.intent_summary
+        assert "客户名称" not in response.review_payload.missing_slots
+        assert "参与人员" not in response.review_payload.missing_slots
+
+
 def test_user_agent_keeps_travel_range_when_user_adds_receipts_after_text_context() -> None:
     session_factory = build_session_factory()
     with session_factory() as db:
@@ -1060,6 +1091,40 @@ def test_user_agent_returns_draft_limit_message_when_save_is_blocked() -> None:
         )
 
 
+def test_user_agent_save_draft_answer_guides_followup_to_existing_draft() -> None:
+    session_factory = build_session_factory()
+    with session_factory() as db:
+        context_json = {"review_action": "save_draft"}
+        ontology = SemanticOntologyService(db).parse(
+            OntologyParseRequest(
+                query="请按当前识别信息保存报销草稿",
+                user_id="pytest",
+                context_json=context_json,
+            )
+        )
+        response = UserAgentService(db).respond(
+            UserAgentRequest(
+                run_id=ontology.run_id,
+                user_id="pytest",
+                message="请按当前识别信息保存报销草稿",
+                ontology=ontology,
+                context_json=context_json,
+                tool_payload={
+                    "claim_id": "claim-1",
+                    "claim_no": "BX202605220001",
+                    "status": "draft",
+                    "approval_stage": "待提交",
+                },
+            )
+        )
+
+        assert response.draft_payload is not None
+        assert response.draft_payload.claim_no == "BX202605220001"
+        assert "已按您当前确认的信息保存为草稿 BX202605220001" in response.answer
+        assert "请关联这张草稿" in response.answer
+        assert "继续保存草稿" not in response.answer
+
+
 def test_user_agent_returns_submitted_draft_payload_for_review_next_step() -> None:
     session_factory = build_session_factory()
     with session_factory() as db:
@@ -2022,6 +2087,8 @@ def test_user_agent_filters_deprecated_review_risk_briefs() -> None:
 def test_user_agent_submission_blocked_risk_level_only_marks_amount_reasons_high() -> None:
     assert UserAgentService._resolve_submission_blocked_risk_level("住宿金额超出当前职级差标") == "high"
     assert UserAgentService._resolve_submission_blocked_risk_level("缺少直属领导或参与人员信息") == "warning"
+    assert UserAgentService._is_submission_exception_explanation_reason("住宿金额超出当前职级差标，且未补充超标说明。")
+    assert not UserAgentService._is_submission_exception_explanation_reason("缺少直属领导或参与人员信息")
 
 
 def test_user_agent_review_payload_shows_ai_precheck_failure_in_main_message() -> None:
@@ -2066,11 +2133,13 @@ def test_user_agent_review_payload_shows_ai_precheck_failure_in_main_message() -
 
         assert response.review_payload is not None
         assert response.answer == response.review_payload.body_message
-        assert response.answer.startswith("AI预审未通过：住宿金额超出当前职级差标")
-        assert "整改后再继续提交" in response.answer
+        assert response.answer.startswith("检测到当前单据存在需要说明的超标风险")
+        assert "票据会先正常归集到单据中" in response.answer
+        assert "附加说明" in response.answer
         assert response.review_payload.can_proceed is False
         blocked_brief = next(item for item in response.review_payload.risk_briefs if item.title == "提交风险提示")
         assert blocked_brief.level == "high"
+        assert "不是票据归集阻断条件" in blocked_brief.detail
         assert not any(item.title == "AI预审未通过" for item in response.review_payload.risk_briefs)