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。

images/eye.svg

@@ -0,0 +1,8 @@
+<!--
+Based on https://www.iconfinder.com/icons/3325119/eye_icon by Cole Bemis.
+Licensed under Creative Commons Attribution 3.0 Unported
+-->
+<svg fill="none" height="24" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg">
+  <path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z"/>
+  <circle cx="12" cy="12" r="3"/>
+</svg>

images/eye_off.svg

@@ -0,0 +1,8 @@
+<!--
+Based on https://www.iconfinder.com/icons/3325118/eye_off_icon by Cole Bemis
+Licensed under Creative Commons Attribution 3.0 Unported
+-->
+<svg fill="none" height="24" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg">
+  <path d="M17.94 17.94A10.07 10.07 0 0 1 12 20c-7 0-11-8-11-8a18.45 18.45 0 0 1 5.06-5.94M9.9 4.24A9.12 9.12 0 0 1 12 4c7 0 11 8 11 8a18.5 18.5 0 0 1-2.16 3.19m-6.72-1.07a3 3 0 1 1-4.24-4.24"/>
+  <line x1="1" x2="23" y1="1" y2="23"/>
+</svg>