CMS 2.0 - Theme engine, logging, admin improvements

Major changes:
- New ThemeManager with Twig templating and SCSS compilation
- Dynamic themes system (themes/default, themes/demo)
- LogManager with SQLite storage and syslog forwarding
- RequestLogger with static helper methods
- Admin UI overhaul (Bootstrap 5, dark mode)
- Admin config page with logging and theme settings
- Admin logs page with filters and search
- Removed legacy Mustache templates
- Removed test plugin and theme
- Composer dependencies: Twig, scssphp, CommonMark, MaxMind GeoIP

vendor/league/uri-interfaces/Exceptions/ConversionFailed.php

@@ -0,0 +1,51 @@
+<?php
+
+/**
+ * League.Uri (https://uri.thephpleague.com)
+ *
+ * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace League\Uri\Exceptions;
+
+use BackedEnum;
+use League\Uri\Idna\Error;
+use League\Uri\Idna\Result;
+use Stringable;
+
+final class ConversionFailed extends SyntaxError
+{
+    private function __construct(
+        string $message,
+        private readonly string $host,
+        private readonly Result $result
+    ) {
+        parent::__construct($message);
+    }
+
+    public static function dueToIdnError(BackedEnum|Stringable|string $host, Result $result): self
+    {
+        $reasons = array_map(fn (Error $error): string => $error->description(), $result->errors());
+
+        if ($host instanceof BackedEnum) {
+            $host = (string) $host->value;
+        }
+
+        return new self('Host `'.$host.'` is invalid: '.implode('; ', $reasons).'.', (string) $host, $result);
+    }
+
+    public function getHost(): string
+    {
+        return $this->host;
+    }
+
+    public function getResult(): Result
+    {
+        return $this->result;
+    }
+}