MRBS 1.12.2 等保2.0二级整改完整提交

包含：登录失败锁定、90天密码有效期、30分钟会话超时、
强制改密、登录审计日志、屏幕水印、企业背景图、
备案信息固定底部、favicon、JS空集合保护、
会话过期体验优化（403 JSON）、display_errors 关闭、
固定 key 根治 Integrity check failed 等全部改动

注意：config.inc.php/.htaccess/.user.ini 含敏感信息，
通过 .gitignore 排除，勿推送到公开仓库。

upgrade/31/pgsql.sql

@@ -0,0 +1,10 @@
+-- Get rid of n-weekly repeats and make all weekly and n-weekly repeats weekly
+
+-- No need to save the current timestamp because timestamps do not auto-update
+-- in PostgreSQL 
+
+-- First set the repeat frequency to 1 for all existing weekly
+-- bookings.  Then turn all n-weekly bookings into weekly bookings
+
+UPDATE %DB_TBL_PREFIX%repeat SET rep_num_weeks=1 WHERE rep_type=2;
+UPDATE %DB_TBL_PREFIX%repeat SET rep_type=2 WHERE rep_type=6;