feat(P25-2/P25-3/P26-2/P28-1/P24-2/P29-3): 落地内部OA够用版前端入口与运营页面

关联 Issue: P25-2, P25-3, P25-4, P26-2, P26-4, P28-1, P28-2, P28-3, P28-4, P24-2, P29-3

client/src/pages/ApprovalRulesPage.tsx

@@ -1,4 +1,5 @@
 import { useEffect, useMemo, useState } from "react";
+import { Link } from "react-router-dom";
 import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
 import { mapApiErrorMessage } from "../api/errorMessages";
 import { isApiError } from "../api/types";
@@ -147,6 +148,11 @@ export function ApprovalRulesPage() {
       <PageHeader
         title="审批规则"
         subtitle="维护金额段与审批层级（仅影响新提交的报销单，历史流程不回写）。"
+        actions={
+          <Button asChild variant="secondary">
+            <Link to="/system/workflow-definitions">查看流程定义</Link>
+          </Button>
+        }
       />
 
       {error ? (