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。

lib/MRBS/Session/SessionIp.php

@@ -0,0 +1,41 @@
+<?php
+declare(strict_types=1);
+namespace MRBS\Session;
+
+use MRBS\User;
+use function MRBS\auth;
+
+/**
+ * Session management scheme that uses IP addresses to identify users.
+ *
+ * Anyone who can access the server can make bookings.  Administrators are also identified by their IP address.
+ *
+ * To use this authentication scheme, set the following things in config.inc.php:
+ *
+ *     $auth['type']    = 'none';
+ *     $auth['session'] = 'ip';
+ *
+ * Then, you may configure admin users:
+ *
+ *     $auth['admin'][] = '127.0.0.1'; // Local host = the server you're running on
+ *     $auth['admin'][] = '192.168.0.1';
+ */
+class SessionIp extends Session
+{
+
+  // No need to prompt for a name - IP address always there
+  public function getCurrentUser() : ?User
+  {
+    global $server;
+
+    if ((!isset($server['REMOTE_ADDR'])) ||
+        (!is_string($server['REMOTE_ADDR'])) ||
+        (($server['REMOTE_ADDR'] === '')))
+    {
+      return parent::getCurrentUser();
+    }
+
+    return auth()->getUser($server['REMOTE_ADDR']);
+  }
+
+}