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_orchestrator_review_flow.py

@@ -228,6 +228,60 @@ def test_conversation_hydration_does_not_reuse_review_type_for_fresh_expense_pro
         assert continued_context["review_form_values"]["expense_type"] == "差旅费"
 
 
+def test_conversation_scope_creates_new_session_for_different_claim() -> None:
+    session_factory = build_session_factory()
+    with session_factory() as db:
+        service = AgentConversationService(db)
+        old_conversation = service.get_or_create_conversation(
+            conversation_id="conv-old-claim-scope",
+            user_id="emp-scope@example.com",
+            source="user_message",
+            context_json={
+                "session_type": "expense",
+                "draft_claim_id": "claim-old",
+                "attachment_names": ["old-hotel.pdf"],
+                "attachment_count": 1,
+                "review_form_values": {
+                    "expense_type": "住宿票",
+                    "merchant_name": "旧酒店",
+                },
+            },
+        )
+        service.append_message(
+            conversation_id=old_conversation.conversation_id,
+            role="user",
+            content="继续补充旧酒店发票",
+        )
+
+        scoped_conversation = service.get_or_create_conversation(
+            conversation_id=old_conversation.conversation_id,
+            user_id="emp-scope@example.com",
+            source="user_message",
+            context_json={
+                "session_type": "expense",
+                "draft_claim_id": "claim-current",
+            },
+        )
+        conflict_context = service.hydrate_context_json(
+            conversation=old_conversation,
+            context_json={"draft_claim_id": "claim-current"},
+            message="继续补充当前单据的火车票",
+        )
+        scoped_context = service.hydrate_context_json(
+            conversation=scoped_conversation,
+            context_json={"draft_claim_id": "claim-current"},
+            message="继续补充当前单据的火车票",
+        )
+
+        db.refresh(old_conversation)
+        assert scoped_conversation.conversation_id != old_conversation.conversation_id
+        assert scoped_conversation.draft_claim_id == "claim-current"
+        assert old_conversation.draft_claim_id == "claim-old"
+        assert conflict_context == {"draft_claim_id": "claim-current"}
+        assert scoped_context["draft_claim_id"] == "claim-current"
+        assert scoped_context["conversation_history"] == []
+
+
 def test_orchestrator_history_query_filters_location_time_and_returns_real_amount(
     monkeypatch,
 ) -> None:
@@ -322,6 +376,89 @@ def test_orchestrator_history_query_filters_location_time_and_returns_real_amoun
         assert "321.45" in response.result["answer"]
 
 
+def test_orchestrator_archive_query_filters_archived_claims_and_limits_preview(
+    monkeypatch,
+) -> None:
+    monkeypatch.setattr(
+        "app.services.runtime_chat.RuntimeChatService.complete",
+        lambda *_args, **_kwargs: None,
+    )
+    session_factory = build_session_factory()
+    with session_factory() as db:
+        employee = Employee(
+            id="emp-archive-query",
+            employee_no="E9021",
+            name="归档员工",
+            email="archive-query@example.com",
+        )
+        claims = []
+        for index in range(6):
+            claims.append(
+                ExpenseClaim(
+                    id=f"claim-archive-query-{index}",
+                    claim_no=f"EXP-ARCHIVE-{index + 1:03d}",
+                    employee=employee,
+                    employee_id=employee.id,
+                    employee_name="归档员工",
+                    department_name="交付部",
+                    expense_type="travel",
+                    reason=f"归档差旅 {index + 1}",
+                    location="上海",
+                    amount=Decimal("100.00") + Decimal(index),
+                    currency="CNY",
+                    invoice_count=1,
+                    occurred_at=datetime(2026, 2, index + 1, 9, 0, tzinfo=UTC),
+                    submitted_at=datetime(2026, 2, index + 2, 10, 0, tzinfo=UTC),
+                    status="approved",
+                    approval_stage="归档入账",
+                )
+            )
+        draft_claim = ExpenseClaim(
+            id="claim-archive-query-draft",
+            claim_no="EXP-ARCHIVE-DRAFT",
+            employee=employee,
+            employee_id=employee.id,
+            employee_name="归档员工",
+            department_name="交付部",
+            expense_type="travel",
+            reason="未归档草稿",
+            location="上海",
+            amount=Decimal("999.00"),
+            currency="CNY",
+            invoice_count=0,
+            occurred_at=datetime(2026, 3, 1, 9, 0, tzinfo=UTC),
+            submitted_at=None,
+            status="draft",
+            approval_stage="待提交",
+        )
+        db.add_all([employee, *claims, draft_claim])
+        db.commit()
+
+        response = OrchestratorService(db).run(
+            OrchestratorRequest(
+                source="user_message",
+                user_id="archive-query@example.com",
+                message="帮我查询一下我的归档的单据有哪些？",
+                context_json={
+                    "client_now_iso": "2026-05-21T04:00:00.000Z",
+                    "client_timezone_offset_minutes": -480,
+                },
+            )
+        )
+
+        query_payload = response.result["query_payload"]
+        assert response.status == "succeeded"
+        assert response.trace_summary.intent == "query"
+        assert query_payload["record_count"] == 6
+        assert query_payload["preview_count"] == 5
+        assert query_payload["preview_limit"] == 5
+        assert query_payload["title"] == "最近 5 条你的归档报销单"
+        assert all(record["status"] == "approved" for record in query_payload["records"])
+        assert "EXP-ARCHIVE-DRAFT" not in [record["claim_no"] for record in query_payload["records"]]
+        assert response.result["suggested_actions"] == []
+        assert "下面先列出最近 5 条记录" in response.result["answer"]
+
+
 def test_orchestrator_expense_preview_does_not_persist_claim_before_user_action(
     monkeypatch,
 ) -> None: