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/MailHandler.php

@@ -0,0 +1,95 @@
+<?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\Formatter\FormatterInterface;
+use Monolog\Formatter\HtmlFormatter;
+
+/**
+ * Base class for all mail handlers
+ *
+ * @author Gyula Sallai
+ *
+ * @phpstan-import-type Record from \Monolog\Logger
+ */
+abstract class MailHandler extends AbstractProcessingHandler
+{
+    /**
+     * {@inheritDoc}
+     */
+    public function handleBatch(array $records): void
+    {
+        $messages = [];
+
+        foreach ($records as $record) {
+            if ($record['level'] < $this->level) {
+                continue;
+            }
+            /** @var Record $message */
+            $message = $this->processRecord($record);
+            $messages[] = $message;
+        }
+
+        if (!empty($messages)) {
+            $this->send((string) $this->getFormatter()->formatBatch($messages), $messages);
+        }
+    }
+
+    /**
+     * Send a mail with the given content
+     *
+     * @param string $content formatted email body to be sent
+     * @param array  $records the array of log records that formed this content
+     *
+     * @phpstan-param Record[] $records
+     */
+    abstract protected function send(string $content, array $records): void;
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function write(array $record): void
+    {
+        $this->send((string) $record['formatted'], [$record]);
+    }
+
+    /**
+     * @phpstan-param non-empty-array<Record> $records
+     * @phpstan-return Record
+     */
+    protected function getHighestRecord(array $records): array
+    {
+        $highestRecord = null;
+        foreach ($records as $record) {
+            if ($highestRecord === null || $highestRecord['level'] < $record['level']) {
+                $highestRecord = $record;
+            }
+        }
+
+        return $highestRecord;
+    }
+
+    protected function isHtmlBody(string $body): bool
+    {
+        return ($body[0] ?? null) === '<';
+    }
+
+    /**
+     * Gets the default formatter.
+     *
+     * @return FormatterInterface
+     */
+    protected function getDefaultFormatter(): FormatterInterface
+    {
+        return new HtmlFormatter();
+    }
+}