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

plugins/test/README.md

@@ -1,3 +0,0 @@
-# test
-
-Dit is een test plugin

plugins/test/config.json

@@ -1,3 +0,0 @@
-{
-    "enabled": true
-}

plugins/test/test.php

@@ -1,35 +0,0 @@
-<?php
-
-class test
-{
-    private ?CMSAPI $api = null;
-    private array $config;
-
-    public function __construct()
-    {
-        $this->config = [
-            'title' => 'Dit is een test plugin',
-            'viewable' => true,
-        ];
-    }
-
-    public function setAPI(CMSAPI $api): void
-    {
-        $this->api = $api;
-    }
-
-    public function getSidebarContent(): string
-    {
-        return 'Hallo';
-    }
-
-    public function getConfig(): array
-    {
-        return $this->config;
-    }
-
-    public function setConfig(array $config): void
-    {
-        $this->config = array_merge($this->config, $config);
-    }
-}