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/SyslogUdp/UdpSocket.php

@@ -0,0 +1,88 @@
+<?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\SyslogUdp;
+
+use Monolog\Utils;
+use Socket;
+
+class UdpSocket
+{
+    protected const DATAGRAM_MAX_LENGTH = 65023;
+
+    /** @var string */
+    protected $ip;
+    /** @var int */
+    protected $port;
+    /** @var resource|Socket|null */
+    protected $socket = null;
+
+    public function __construct(string $ip, int $port = 514)
+    {
+        $this->ip = $ip;
+        $this->port = $port;
+    }
+
+    /**
+     * @param  string $line
+     * @param  string $header
+     * @return void
+     */
+    public function write($line, $header = "")
+    {
+        $this->send($this->assembleMessage($line, $header));
+    }
+
+    public function close(): void
+    {
+        if (is_resource($this->socket) || $this->socket instanceof Socket) {
+            socket_close($this->socket);
+            $this->socket = null;
+        }
+    }
+
+    /**
+     * @return resource|Socket
+     */
+    protected function getSocket()
+    {
+        if (null !== $this->socket) {
+            return $this->socket;
+        }
+
+        $domain = AF_INET;
+        $protocol = SOL_UDP;
+        // Check if we are using unix sockets.
+        if ($this->port === 0) {
+            $domain = AF_UNIX;
+            $protocol = IPPROTO_IP;
+        }
+
+        $this->socket = socket_create($domain, SOCK_DGRAM, $protocol) ?: null;
+        if (null === $this->socket) {
+            throw new \RuntimeException('The UdpSocket to '.$this->ip.':'.$this->port.' could not be opened via socket_create');
+        }
+
+        return $this->socket;
+    }
+
+    protected function send(string $chunk): void
+    {
+        socket_sendto($this->getSocket(), $chunk, strlen($chunk), $flags = 0, $this->ip, $this->port);
+    }
+
+    protected function assembleMessage(string $line, string $header): string
+    {
+        $chunkSize = static::DATAGRAM_MAX_LENGTH - strlen($header);
+
+        return $header . Utils::substr($line, 0, $chunkSize);
+    }
+}