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/Monolog/Handler/SyslogHandler.php

@@ -0,0 +1,68 @@
+<?php declare(strict_types=1);
+
+/*
+ * This file is part of the Monolog package.
+ *
+ * (c) Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Monolog\Handler;
+
+use Monolog\Logger;
+use Monolog\Utils;
+
+/**
+ * Logs to syslog service.
+ *
+ * usage example:
+ *
+ *   $log = new Logger('application');
+ *   $syslog = new SyslogHandler('myfacility', 'local6');
+ *   $formatter = new LineFormatter("%channel%.%level_name%: %message% %extra%");
+ *   $syslog->setFormatter($formatter);
+ *   $log->pushHandler($syslog);
+ *
+ * @author Sven Paulus <sven@karlsruhe.org>
+ */
+class SyslogHandler extends AbstractSyslogHandler
+{
+    /** @var string */
+    protected $ident;
+    /** @var int */
+    protected $logopts;
+
+    /**
+     * @param string     $ident
+     * @param string|int $facility Either one of the names of the keys in $this->facilities, or a LOG_* facility constant
+     * @param int        $logopts  Option flags for the openlog() call, defaults to LOG_PID
+     */
+    public function __construct(string $ident, $facility = LOG_USER, $level = Logger::DEBUG, bool $bubble = true, int $logopts = LOG_PID)
+    {
+        parent::__construct($facility, $level, $bubble);
+
+        $this->ident = $ident;
+        $this->logopts = $logopts;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function close(): void
+    {
+        closelog();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function write(array $record): void
+    {
+        if (!openlog($this->ident, $this->logopts, $this->facility)) {
+            throw new \LogicException('Can\'t open syslog for ident "'.$this->ident.'" and facility "'.$this->facility.'"' . Utils::getRecordMessageForException($record));
+        }
+        syslog($this->logLevels[$record['level']], (string) $record['formatted']);
+    }
+}