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/src/app/services/expense_claims.py

@@ -169,6 +169,19 @@ class ExpenseClaimService(
         stmt = self._access_policy.apply_approval_claim_scope(stmt, current_user)
         return list(self.db.scalars(stmt).all())
 
+    def list_archived_claims(self, current_user: CurrentUserContext) -> list[ExpenseClaim]:
+        stmt = (
+            select(ExpenseClaim)
+            .options(
+                selectinload(ExpenseClaim.items),
+                selectinload(ExpenseClaim.employee).selectinload(Employee.manager),
+                selectinload(ExpenseClaim.employee).selectinload(Employee.roles),
+            )
+            .order_by(ExpenseClaim.updated_at.desc(), ExpenseClaim.submitted_at.desc(), ExpenseClaim.created_at.desc())
+        )
+        stmt = self._access_policy.apply_archived_claim_scope(stmt, current_user)
+        return list(self.db.scalars(stmt).all())
+
     def get_claim(self, claim_id: str, current_user: CurrentUserContext) -> ExpenseClaim | None:
         stmt = (
             select(ExpenseClaim)