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()

public/admin.php

@@ -88,6 +88,10 @@ switch ($route) {
         handleConfig($auth, $appConfig);
         break;
 
+    case 'update':
+        handleUpdate($auth, $appConfig);
+        break;
+
     case 'theme':
         handleTheme($auth, $appConfig);
         break;
@@ -1518,6 +1522,65 @@ function handleLogs(AdminAuth $auth, array $config): void
     require __DIR__ . '/../admin/templates/layout.php';
 }
 
+function handleUpdate(AdminAuth $auth, array $config): void
+{
+    $user = $auth->getCurrentUser();
+    $csrf = $auth->getCsrfToken();
+    $message = '';
+    $messageType = '';
+    $updateOutput = '';
+
+    // Load CMS version
+    $versionFile = $config['codepress_root'] . '/version.php';
+    $cmsVersion = '1.7.1';
+    if (file_exists($versionFile)) {
+        $verData = require $versionFile;
+        $cmsVersion = is_array($verData) ? ($verData['version'] ?? '1.7.1') : '1.7.1';
+    }
+
+    // Get git branch
+    $gitBranch = 'main';
+    if (function_exists('exec')) {
+        @exec('git rev-parse --abbrev-ref HEAD 2>&1', $branchOutput);
+        if (!empty($branchOutput[0]) && strpos($branchOutput[0], 'fatal') === false) {
+            $gitBranch = trim($branchOutput[0]);
+        }
+    }
+
+    if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+        if (!$auth->verifyCsrf($_POST['csrf_token'] ?? '')) {
+            $message = 'Ongeldige CSRF token.';
+            $messageType = 'danger';
+        } else {
+            $root = $config['codepress_root'];
+            $cmd = 'cd ' . escapeshellarg($root) . ' && git pull origin ' . escapeshellarg($gitBranch) . ' 2>&1';
+            
+            $outputLines = [];
+            $returnCode = -1;
+            if (function_exists('exec')) {
+                @exec($cmd, $outputLines, $returnCode);
+                $updateOutput = implode("\n", $outputLines);
+            } else {
+                $updateOutput = 'exec() is uitgeschakeld op de PHP server.';
+                $returnCode = 1;
+            }
+
+            if ($returnCode === 0) {
+                adminLog($config, 'info', $user['username'] . ' voerde een succesvolle systeemupdate uit');
+                $message = 'Systeem succesvol bijgewerkt naar de nieuwste versie!';
+                $messageType = 'success';
+            } else {
+                adminLog($config, 'warning', $user['username'] . ' probeerde een systeemupdate uit te voeren: ' . $updateOutput);
+                $message = 'Fout bij het bijwerken van het systeem. Bekijk de resultaten hieronder.';
+                $messageType = 'danger';
+            }
+        }
+    }
+
+    $route = 'update';
+    require __DIR__ . '/../admin/templates/layout.php';
+}
+
 // --- Frontmatter helpers ---
 
 function parseFrontmatterField(string $content, string $key, string $default = ''): string