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()

admin/templates/pages/update.php

@@ -0,0 +1,56 @@
+<h2 class="mb-4"><i class="bi bi-cloud-arrow-down"></i> Systeem Update</h2>
+
+<?php if (!empty($updateOutput)): ?>
+    <div class="card shadow-sm mb-4">
+        <div class="card-header bg-dark text-white">
+            <i class="bi bi-terminal"></i> Update Resultaten
+        </div>
+        <div class="card-body bg-dark text-light p-3">
+            <pre class="m-0 text-light" style="font-family: monospace; font-size: 0.9rem;"><?= htmlspecialchars($updateOutput) ?></pre>
+        </div>
+    </div>
+<?php endif; ?>
+
+<div class="card shadow-sm mb-4">
+    <div class="card-header">
+        <i class="bi bi-info-circle"></i> Systeeminformatie
+    </div>
+    <div class="card-body">
+        <div class="row">
+            <div class="col-md-6 mb-3">
+                <strong>Huidige CMS Versie:</strong>
+                <span class="badge bg-primary ms-2"><?= htmlspecialchars($cmsVersion ?? '1.7.1') ?></span>
+            </div>
+            <div class="col-md-6 mb-3">
+                <strong>Configuratiestatus:</strong>
+                <span class="badge bg-success ms-2"><i class="bi bi-check-circle"></i> Lokaal afgeschermd (Git-safe)</span>
+            </div>
+        </div>
+        <p class="text-muted small mb-0">
+            Lokale configuratiebestanden (zoals <code>config.json</code> en <code>admin.json</code>) zijn uitgesloten van Git. 
+            Hierdoor blijven je instellingen, wachtwoorden en content veilig behouden tijdens het bijwerken.
+        </p>
+    </div>
+</div>
+
+<div class="card shadow-sm mb-4">
+    <div class="card-header">
+        <i class="bi bi-arrow-repeat"></i> CodePress CMS Bijwerken
+    </div>
+    <div class="card-body">
+        <p>Haal automatisch de nieuwste CMS updates op via het Git repository.</p>
+
+        <?php if (!empty($gitBranch)): ?>
+            <div class="mb-3">
+                <small class="text-muted">Git branch: <code><?= htmlspecialchars($gitBranch) ?></code></small>
+            </div>
+        <?php endif; ?>
+
+        <form method="POST" action="/admin/update">
+            <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($csrf) ?>">
+            <button type="submit" class="btn btn-primary btn-lg" onclick="return confirm('Weet je zeker dat je het systeem wilt bijwerken naar de nieuwste versie?')">
+                <i class="bi bi-cloud-download"></i> Systeem nu bijwerken
+            </button>
+        </form>
+    </div>
+</div>