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/design2/ui.js

@@ -1311,7 +1311,6 @@ $('#open').click(function () {
         }
     )
     function OpenDialog() {
-        if (typeof window.soonRequireLogin === 'function' && !window.soonRequireLogin('打开文件')) return;
         var dialogApi = (typeof dialog !== 'undefined' && dialog) ? dialog : (window.platformBridge && window.platformBridge.showOpenDialog ? { showOpenDialog: function(opts) { return window.platformBridge.showOpenDialog(opts); } } : null);
         if (!dialogApi) return;
         dialogApi.showOpenDialog({ title: '请选择文件', buttonLabel: language_str('comf'), filters: [{ name: 'Soon File Type', extensions: ['soon'] }] })
@@ -1327,6 +1326,14 @@ $('#open').click(function () {
                     if (typeof window.openFile === 'function') window.openFile(fileKey, j);
                 }
                 function importAndOpen(j, fileName) {
+                    var tok = typeof window.soonGetAccessToken === 'function'
+                        ? window.soonGetAccessToken()
+                        : (localStorage.getItem('soon_access') || '');
+                    if (!tok && typeof window.soonPutSoonSession === 'function') {
+                        var localKey = window.soonPutSoonSession(j, fileName || 'design.soon');
+                        if (localKey) openWithKey(localKey, j);
+                        return;
+                    }
                     if (!window.platformBridge || !window.platformBridge.importSoonFile) return;
                     window.platformBridge.importSoonFile(fileName || 'design.soon', j).then(function(res) {
                         if (res && res.fileKey) openWithKey(res.fileKey, j);
@@ -2694,7 +2701,6 @@ $("#help").click(function() {
 
 // ===========================================================
 $('#display').off('click').on('click', function () {
-    if (typeof window.soonGuardMemberPreview === 'function' && !window.soonGuardMemberPreview()) return;
     // 类型改变
     fabric.Image.fromURL(soonAsset('front_bg') + bg_version + '_2.png', function (i1) {
         i1.left = background_image.left