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。

version.inc

@@ -0,0 +1,34 @@
+<?php
+declare(strict_types=1);
+namespace MRBS;
+
+// This should probably be a class, but you can only have protected
+// class members in PHP 5, so we won't bother
+
+function get_mrbs_version() : string
+{
+  // Read the actual version number from a much simpler file
+  require MRBS_ROOT . '/version_num.inc';
+
+  global $git_command;
+
+  $mrbs_version = "MRBS $mrbs_version_number";
+
+  if (function_exists('exec') && !function_disabled('exec'))
+  {
+    // Suppress any errors because we are only interested in success
+    $git_out = @exec("$git_command git rev-parse --abbrev-ref HEAD", $output, $retval);
+
+    if (($retval == 0) && (strlen($git_out)))
+    {
+      $git_out2 = @exec("$git_command git rev-parse --short HEAD", $output, $retval);
+
+      if (($retval == 0) && (strlen($git_out2)))
+      {
+        $mrbs_version .= "+git ($git_out $git_out2)";
+      }
+    }
+  }
+
+  return $mrbs_version;
+}