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

cms/core/class/Logger.php

@@ -98,6 +98,14 @@ class Logger {
         
         // Write to file with error suppression (graceful degradation)
         @file_put_contents(self::$logFile, $line, FILE_APPEND | LOCK_EX);
+
+        // Route through the dynamic log manager (errors/system events)
+        if (class_exists('LogManager')) {
+            $event = ($level === self::ERROR || $level === self::WARNING)
+                ? LogManager::EVENT_ERRORS
+                : LogManager::EVENT_SYSTEM;
+            LogManager::log($event, strtolower($level), $message, $context);
+        }
     }
     
     /**