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/7/mysql.sql

@@ -0,0 +1 @@
+# Nothing to do

upgrade/7/post.inc

@@ -0,0 +1,18 @@
+<?php
+namespace MRBS;
+
+// Update the area table getting rid of NULLs for the private settings and replacing them
+// with the default settings.
+
+global $private_enabled, $private_default, $private_mandatory, $private_override;
+
+// Convert booleans to 1 or 0, as the fields are tinyints/smallints
+$private_enabled = ($private_enabled) ? 1 : 0;
+$private_default = ($private_default) ? 1 : 0;
+$private_mandatory = ($private_mandatory) ? 1 : 0;
+
+$tbl_area = _tbl('area');
+$upgrade_handle->command("UPDATE $tbl_area SET private_enabled=$private_enabled WHERE private_enabled IS NULL");
+$upgrade_handle->command("UPDATE $tbl_area SET private_default=$private_default WHERE private_default IS NULL");
+$upgrade_handle->command("UPDATE $tbl_area SET private_mandatory=$private_mandatory WHERE private_mandatory IS NULL");
+$upgrade_handle->command("UPDATE $tbl_area SET private_override='$private_override' WHERE private_override IS NULL");