Add system update feature, git-ignore local configs, and fix homepage request logging

- Exclude config.json and admin.json in .gitignore so live settings/passwords are never overwritten by git
- Auto-generate config.json and admin.json with defaults if missing
- Add config.json.example and admin.json.example reference templates
- Add System Update page (/admin/update) in Admin Console to pull updates via Git with 1 click
- Log effective page name in index.php instead of literal 'auto'
- Add extra HAProxy/PFSense proxy headers to RequestLogger::getClientIp()

cms/core/class/RequestLogger.php

@@ -29,6 +29,8 @@ class RequestLogger
             'HTTP_CF_CONNECTING_IP',
             'HTTP_X_REAL_IP',
             'HTTP_CLIENT_IP',
+            'HTTP_X_CLIENT_IP',
+            'HTTP_X_CLUSTER_CLIENT_IP',
             'HTTP_X_FORWARDED_FOR',
             'HTTP_X_FORWARDED',
             'HTTP_FORWARDED_FOR',

cms/core/config.php

@@ -2,6 +2,42 @@
 
 // Simple configuration loader
 $configJsonPath = __DIR__ . '/../../config.json';
+$configExamplePath = __DIR__ . '/../../config.json.example';
+
+// Auto-create config.json if it does not exist
+if (!file_exists($configJsonPath)) {
+    if (file_exists($configExamplePath)) {
+        @copy($configExamplePath, $configJsonPath);
+    } else {
+        $defaultConfig = [
+            'site_title' => 'CodePress',
+            'content_dir' => 'content',
+            'templates_dir' => 'cms/templates',
+            'active_theme' => 'default',
+            'default_page' => 'auto',
+            'language' => [
+                'default' => 'nl',
+                'available' => ['nl', 'en']
+            ],
+            'seo' => [
+                'description' => 'CodePress CMS - Lightweight file-based content management system',
+                'keywords' => 'cms, php, content management, file-based'
+            ],
+            'author' => [
+                'name' => 'E. Noorlander',
+                'website' => 'https://noorlander.info'
+            ],
+            'show_version' => true,
+            'enabled_plugins' => ['MQTTTracker', 'HTMLBlock'],
+            'features' => [
+                'auto_link_pages' => true,
+                'search_enabled' => true,
+                'breadcrumbs_enabled' => true
+            ]
+        ];
+        @file_put_contents($configJsonPath, json_encode($defaultConfig, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE));
+    }
+}
 
 if (file_exists($configJsonPath)) {
     $jsonContent = file_get_contents($configJsonPath);