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/maxmind/web-service-common/README.md

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+# Common Code for MaxMind Web Service Clients #
+
+This is _not_ intended for direct use by third parties. Rather, it is for
+shared code between MaxMind's various web service client APIs.
+
+## Requirements  ##
+
+The library requires PHP 8.1 or greater.
+
+There are several other dependencies as defined in the `composer.json` file.
+
+## Contributing ##
+
+Patches and pull requests are encouraged. All code should follow the PSR-12
+style guidelines. Please include unit tests whenever possible.
+
+## Versioning ##
+
+This API uses [Semantic Versioning](https://semver.org/).
+
+## Copyright and License ##
+
+This software is Copyright (c) 2015-2026 by MaxMind, Inc.
+
+This is free software, licensed under the Apache License, Version 2.0.