用户管理和分配管理：分页按钮优化，支持切换每页条数并持久化

web/frontend/src/pages/UsersPage.tsx

@@ -41,6 +41,11 @@ export default function UsersPage() {
   const [modalOpen, setModalOpen] = useState(false);
   const [editing, setEditing] = useState<UserInfo | null>(null);
   const [form] = Form.useForm();
+  const [pageSize, setPageSize] = useState(() => {
+    const v = localStorage.getItem('user_page_size');
+    return v ? Number(v) || 20 : 20;
+  });
+  const [currentPage, setCurrentPage] = useState(1);
 
   // 权限管理
   const [permModalOpen, setPermModalOpen] = useState(false);
@@ -222,7 +227,20 @@ export default function UsersPage() {
         rowKey="id"
         loading={loading}
         size="small"
-        pagination={{ pageSize: 20 }}
+        pagination={{
+          current: currentPage,
+          pageSize,
+          showSizeChanger: true,
+          showTotal: (t) => `共 ${t} 条`,
+          onChange: (page, size) => {
+            setCurrentPage(page);
+            if (size !== pageSize) {
+              setPageSize(size);
+              localStorage.setItem('user_page_size', String(size));
+              setCurrentPage(1); // 切换 pageSize 时重置到第1页
+            }
+          },
+        }}
       />
 
       {/* 编辑/新建用户 Modal */}