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/symfony/filesystem/composer.json

@@ -0,0 +1,34 @@
+{
+    "name": "symfony/filesystem",
+    "type": "library",
+    "description": "Provides basic utilities for the filesystem",
+    "keywords": [],
+    "homepage": "https://symfony.com",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Fabien Potencier",
+            "email": "fabien@symfony.com"
+        },
+        {
+            "name": "Symfony Community",
+            "homepage": "https://symfony.com/contributors"
+        }
+    ],
+    "require": {
+        "php": ">=8.4.1",
+        "symfony/deprecation-contracts": "^2.5|^3",
+        "symfony/polyfill-ctype": "~1.8",
+        "symfony/polyfill-mbstring": "~1.8"
+    },
+    "require-dev": {
+        "symfony/process": "^7.4|^8.0"
+    },
+    "autoload": {
+        "psr-4": { "Symfony\\Component\\Filesystem\\": "" },
+        "exclude-from-classmap": [
+            "/Tests/"
+        ]
+    },
+    "minimum-stability": "dev"
+}