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/Contracts/FragmentDirective.php

@@ -0,0 +1,55 @@
+<?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\Contracts;
+
+use Stringable;
+
+/**
+ * @see https://wicg.github.io/scroll-to-text-fragment/#the-fragment-directive
+ *
+ * @method string toFragmentValue() returns the encoded string representation of the directive as a fragment string
+ */
+interface FragmentDirective extends Stringable
+{
+    /**
+     * The decoded Directive name.
+     *
+     * @return non-empty-string
+     */
+    public function name(): string;
+
+    /**
+     * The decoded Directive value.
+     */
+    public function value(): ?string;
+
+    /**
+     * The encoded string representation of the directive.
+     */
+    public function toString(): string;
+
+    /**
+     * The encoded string representation of the fragment using
+     * the Stringable interface.
+     *
+     * @see FragmentDirective::toString()
+     */
+    public function __toString(): string;
+
+    /**
+     * Tells whether the submitted value is equals to the string
+     * representation of the given directive.
+     */
+    public function equals(mixed $directive): bool;
+}