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/js/common/portal-topbar.js

@@ -3,7 +3,6 @@
 
   var STANDARD_LINKS = [
     { id: 'home', href: 'index.web.html', label: '设计首页', show: 'always' },
-    { id: 'member', href: 'member.web.html', label: '订阅', show: 'authed', elId: 'auth_member' },
     { id: 'admin', href: 'admin/index.html', label: '管理', show: 'admin', elId: 'auth_admin' },
   ];
 
@@ -22,7 +21,6 @@
       '<span id="auth_identity" class="soon-portal-identity" style="display:none"></span>' +
       '</div>' +
       '<nav class="soon-portal-topbar__session" id="auth_session" style="display:none" aria-label="账户">' +
-      '<a href="member.web.html" id="auth_member" class="soon-portal-topbar__link" style="display:none">订阅</a>' +
       '<a href="admin/index.html" id="auth_admin" class="soon-portal-topbar__link" style="display:none">管理</a>' +
       '<a href="#" id="auth_logout" class="soon-portal-topbar__link" style="display:none">退出</a>' +
       '</nav>';
@@ -30,7 +28,7 @@
 
   function renderLinks(links, active) {
     return links.map(function (lnk) {
-      if (lnk.id === 'member' || lnk.id === 'admin') return '';
+      if (lnk.id === 'admin') return '';
       var cls = 'soon-portal-topbar__link' + (active === lnk.id ? ' is-active' : '');
       return '<a href="' + esc(lnk.href) + '" class="' + cls + '">' + esc(lnk.label) + '</a>';
     }).join('');
@@ -46,7 +44,7 @@
   /**
    * @param {object} opts
    * @param {string} [opts.variant] standard | auth | design
-   * @param {string} [opts.active] home | member
+   * @param {string} [opts.active] home
    * @param {string} [opts.extraClass]
    */
   function html(opts) {