fix: Cookie管理页面分页选择无法保存，pageSize改为state管理+localStorage持久化

web/frontend/src/pages/CookiePage.tsx

@@ -38,6 +38,11 @@ export default function CookiePage() {
   const [loading, setLoading] = useState(false);
   const [selectedRowKeys, setSelectedRowKeys] = useState<React.Key[]>([]);
   const [searchText, setSearchText] = useState('');
+  const [pageSize, setPageSize] = useState(() => {
+    const v = localStorage.getItem('cookie_page_size');
+    return v ? Number(v) || 20 : 20;
+  });
+  const [currentPage, setCurrentPage] = useState(1);
   const { can } = usePermissions();
 
   const canView = can('cookie:view');
@@ -254,7 +259,20 @@ export default function CookiePage() {
         rowKey="id"
         loading={loading}
         size="small"
-        pagination={{ pageSize: 20, showSizeChanger: true, showTotal: (t) => `共 ${t} 条` }}
+        pagination={{
+          current: currentPage,
+          pageSize,
+          showSizeChanger: true,
+          showTotal: (t) => `共 ${t} 条`,
+          onChange: (page, size) => {
+            setCurrentPage(page);
+            if (size !== pageSize) {
+              setPageSize(size);
+              localStorage.setItem('cookie_page_size', String(size));
+              setCurrentPage(1); // 切换 pageSize 时重置到第1页
+            }
+          },
+        }}
         scroll={{ x: 900 }}
       />
     </div>