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/YearRanger.php

@@ -0,0 +1,54 @@
+<?php
+declare(strict_types=1);
+namespace MRBS;
+
+
+// A class for expressing two years as a range, eg "2025/26"
+// TODO: Is there a standard class that will do this?  Couldn't find one.
+// TODO: Handle non-consecutive years, eg "2025-27".
+class YearRanger
+{
+  private $locale;
+  private $separator = '/';
+
+  public function __construct(string $locale)
+  {
+    $this->locale = $locale;
+  }
+
+
+  public function format(\DateTime $start, \DateTime $end) : string
+  {
+    $formatter = new \IntlDateFormatter($this->locale);
+    $formatter->setPattern('y');
+    $start_string = $formatter->format($start);
+    $end_string = $formatter->format($end);
+
+    // There's no range
+    if ($start_string == $end_string)
+    {
+      return $start_string;
+    }
+
+    // Get the range
+    // If we're dealing with 4-digit Arabic numerals, and the centuries are the
+    // same, then shorten the end year.
+    $pattern = '/^\d{4}$/';  // exactly four digits, eg '2025'
+    if (preg_match($pattern, $start_string) && preg_match($pattern, $end_string))
+    {
+      $start_century = mb_substr($start_string, 0, 2);
+      $end_century = mb_substr($end_string, 0, 2);
+      if ($start_century == $end_century)
+      {
+        $end_string = mb_substr($end_string, 2);
+      }
+    }
+    return $start_string . $this->separator . $end_string;
+  }
+
+
+  public function setSeparator(string $separator) : void
+  {
+    $this->separator = $separator;
+  }
+}