Ship signup sheet, subscribe reminders, cover crop, and theme updates.

Wire real WeChat app config, prefer activity cover over posters, and add admin cover cropping for the home banner.

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

miniprogram/config.js

@@ -1,4 +1,4 @@
-/** 后端地址。上线改为 HTTPS 域名，并加入小程序 request / downloadFile 合法域名。 */
-const BASE = 'http://127.0.0.1:3000'
+/** 后端地址。上线域名需加入小程序 request / uploadFile / downloadFile 合法域名。 */
+const BASE = 'https://dev.zmh.zm.luckypay.cc'
 
-module.exports = { BASE }
+module.exports = { BASE: BASE }