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。

tzurl/zoneinfo/Europe/Volgograd.ics

@@ -0,0 +1,108 @@
+BEGIN:VCALENDAR
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+VERSION:2.0
+BEGIN:VTIMEZONE
+TZID:Europe/Volgograd
+LAST-MODIFIED:20251211T094730Z
+TZURL:https://www.tzurl.org/zoneinfo/Europe/Volgograd
+X-LIC-LOCATION:Europe/Volgograd
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+END:VCALENDAR