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

config.json.example

@@ -1,7 +1,6 @@
 {
     "site_title": "CodePress",
     "content_dir": "content",
-    "templates_dir": "cms/templates",
     "active_theme": "default",
     "default_page": "auto",
     "language": {
@@ -17,7 +16,7 @@
     },
     "author": {
         "name": "E. Noorlander",
-        "website": "https://noorlander.info"
+        "website": "noorlander.info"
     },
     "show_version": true,
     "enabled_plugins": [
@@ -48,6 +47,29 @@
         "geoip_mmdb_path": "",
         "geoip_api_url": "",
         "geoip_api_key": "",
-        "retention_days": 400
+        "retention_days": 400,
+        "excluded_ips": [
+            "192.168.0.0/16",
+            "10.0.0.0/8",
+            "172.16.0.0/12",
+            "127.0.0.1",
+            "::1"
+        ]
+    },
+    "logging": {
+        "enabled": true,
+        "driver": "sqlite",
+        "syslog_host": "",
+        "syslog_port": 514,
+        "syslog_facility": "local0",
+        "syslog_ident": "codepress",
+        "events": {
+            "admin": true,
+            "requests": true,
+            "errors": true,
+            "security": true,
+            "content": true,
+            "system": true
+        }
     }
 }