永久会员与模板库后台化：预览门控、轻量首页与 Admin CRUD

- 会员改为永久激活方案；云端文件不再拦截非会员；预览弹窗内导出/打印才校验
- 首页最近文件支持本地记录，登录后与云端合并；移除独立会员页与订阅页
- 模板库入库管理：soon_templates 表、Admin 上传 CRUD、/templates 轻量列表与按需下载

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend-web/pages/design2.web.html

@@ -12,7 +12,6 @@
     <link rel="stylesheet" href="../assets/css/portal.css">
     <link rel="stylesheet" href="../assets/css/design.css">
     <link rel="stylesheet" href="../assets/css/subscribe-gate.css">
-    <link rel="stylesheet" href="../assets/css/member.css">
     <style>
         /* 标尺样式 */
         .ruler-container {
@@ -669,7 +668,6 @@
     <script src="../js/common/auth-redirect.js"></script>
     <script src="../js/common/auth-session.js"></script>
     <script src="../js/common/member-pay-core.js"></script>
-    <script src="../js/common/member-plan-core.js"></script>
     <script src="../js/common/cloud-files.js"></script>
     <script src="../js/common/asset-base.js"></script>
     <script src="../js/common/portal-topbar.js"></script>
@@ -677,7 +675,8 @@
     <script src="../vendor/layui/layui.js"></script>
     <script src="../vendor/js/qrcode.min.js"></script>
     <script src="../js/common/soon-toast.js"></script>
-    <script src="../js/common/member-subscribe.js"></script>
+    <script src="../js/common/member-login-gate.js"></script>
+    <script src="../js/common/member-activate.js"></script>
     <script src="../js/platform/web.js?v=basepath2"></script>
     <script src="../vendor/js/jr-qrcode.js"></script>
     <script src="../vendor/js/JsBarcode.all.min.js"></script>