前端配置迁至 config/local.js，完善支付、模板库与部署脚本

- 页面直接引用 local.js 设置 SOON_DEPLOY_CONFIG，移除 deploy-config
- Docker sync-config 生成 local.js；更新 README 与 agent-core 说明
- 模板库自动扫描 .soon；新增后端部署/种子/排查脚本
- 完善支付配置、订阅弹窗与后台支付管理页

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

frontend-web/js/member.js

@@ -263,7 +263,8 @@
         if (act === 'pay') {
           openPayModal(null, btn.dataset.plan, btn.dataset.price, {
             orderNo: no,
-            channel: btn.dataset.channel || 'wechat',
+            channel: btn.dataset.channel || (window.SoonMemberPay && SoonMemberPay.defaultChannel
+              ? SoonMemberPay.defaultChannel() : 'alipay'),
           });
           return;
         }
@@ -403,7 +404,7 @@
       planName: planName,
       priceDisplay: priceDisplay,
       orderNo: opts.orderNo,
-      channel: opts.channel || 'wechat',
+      channel: opts.channel || (payCore.defaultChannel ? payCore.defaultChannel() : 'alipay'),
       onPaid: function () {
         showPayBanner();
         loadMembership();