r004: Auto-Restart + WebGUI-Restart-Button + dynamische Version

- Auto-Restart: Binary erkennt Update auf Platte (mtime/size) → rc.mua restart
- WebGUI: 'MUA neu starten'-Button (POST /restart über Config-Server)
- POST-INSTALL/UPDATE: Service wird nach Installation/Update automatisch neu gestartet
- WebGUI: Version dynamisch aus /health (kein hartkodiertes rNNN)
- MUA_VERSION in helpers.ts auf r004
- .txz neu gepackt, SHA256 aktualisiert

scripts/mua.page

@@ -49,6 +49,13 @@ $health_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
 curl_close($ch);
 $health_ok = ($health_code === 200);
 
+// Version aus /health lesen (dynamisch, kein hartkodiertes rNNN)
+$running_version = '';
+if ($health_ok && $health !== false) {
+    $h = json_decode($health, true);
+    $running_version = $h['version'] ?? '';
+}
+
 // ── Config vom Config-Server laden (Port 3003) ──────────────────────────
 $config = null;
 $ch = curl_init('http://127.0.0.1:' . $config_port . '/config');
@@ -91,6 +98,27 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         $payload['enabledTools'] = $selected;
     }
 
+    // C) Service neu starten
+    if (isset($_POST['action']) && $_POST['action'] === 'restart') {
+        $ch = curl_init('http://127.0.0.1:' . $config_port . '/restart');
+        curl_setopt_array($ch, [
+            CURLOPT_RETURNTRANSFER => true,
+            CURLOPT_TIMEOUT => 5,
+            CURLOPT_CONNECTTIMEOUT => 3,
+            CURLOPT_POST => true,
+        ]);
+        $resp_raw = curl_exec($ch);
+        $resp_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
+        curl_close($ch);
+        if ($resp_code === 200) {
+            $flash_msg = 'MUA wird neu gestartet (Service restart).';
+            $flash_type = 'ok';
+        } else {
+            $flash_msg = 'Fehler beim Neustart (HTTP ' . $resp_code . ')';
+            $flash_type = 'err';
+        }
+    }
+
     if (!empty($payload)) {
         $ch = curl_init('http://127.0.0.1:' . $config_port . '/config');
         curl_setopt_array($ch, [
@@ -248,7 +276,7 @@ $tool_groups = [
 <h2>Details</h2>
 <table>
 <tr><th>Plugin</th><td>MUA (Mikes Unraid Agent)</td></tr>
-<tr><th>Version</th><td>2026.08.18.r003</td></tr>
+<tr><th>Version</th><td><?php echo $running_version ? htmlspecialchars($running_version) : '—'; ?></td></tr>
 <tr><th>Runtime</th><td>TypeScript (Bun Runtime, kompiliertes Binary)</td></tr>
 <tr><th>Binary</th><td><code><?= $binary ?></code> <?= $binary_exists ? '✅' : '❌ fehlt' ?></td></tr>
 <tr><th>Port (MCP)</th><td><?= $port ?></td></tr>
@@ -268,3 +296,10 @@ $tool_groups = [
 <tr><td>Status</td><td><code>/etc/rc.d/rc.mua status</code></td></tr>
 <tr><td>Logs</td><td><code>tail -f /var/log/plugins/mua.log</code></td></tr>
 </table>
+
+<h2>Service neu starten</h2>
+<p>Startet den MCP-Service neu (z.&nbsp;B. nach einem Plugin-Update, wenn sich das Binary geändert hat).</p>
+<form method="post" onsubmit="return confirm('MUA-Service neu starten?');">
+  <input type="hidden" name="action" value="restart">
+  <button type="submit" class="btn btn-primary">🔄 MUA neu starten</button>
+</form>