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/composer/autoload_files.php

@@ -7,5 +7,11 @@ $baseDir = dirname($vendorDir);
 
 return array(
     '6e3fae29631ef280660b3cdad06f25a8' => $vendorDir . '/symfony/deprecation-contracts/function.php',
+    '320cde22f66dd4f5d3fd621d3e88b98f' => $vendorDir . '/symfony/polyfill-ctype/bootstrap.php',
+    '0e6d7bf4a5811bfa5cf40c5ccd6fae6a' => $vendorDir . '/symfony/polyfill-mbstring/bootstrap.php',
     'a4a119a56e50fbb293281d9a48007e0e' => $vendorDir . '/symfony/polyfill-php80/bootstrap.php',
+    '89efb1254ef2d1c5d80096acd12c4098' => $vendorDir . '/twig/twig/src/Resources/core.php',
+    'ffecb95d45175fd40f75be8a23b34f90' => $vendorDir . '/twig/twig/src/Resources/debug.php',
+    'c7baa00073ee9c61edf148c51917cfb4' => $vendorDir . '/twig/twig/src/Resources/escaper.php',
+    'f844ccf1d25df8663951193c3fc307c8' => $vendorDir . '/twig/twig/src/Resources/string_loader.php',
 );