fix: TTS toggle global above engine selector, health check /docs

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

xtts/bridge.js

@@ -256,7 +256,7 @@ log(`RVS: ${RVS_HOST}:${RVS_PORT}`);
 // Warten bis XTTS API erreichbar ist
 function waitForXTTS(callback, attempts) {
   if (attempts <= 0) { log("XTTS API nicht erreichbar — starte trotzdem"); callback(); return; }
-  http.get(`${XTTS_API_URL}/`, (res) => {
+  http.get(`${XTTS_API_URL}/docs`, (res) => {
     log(`XTTS API erreichbar (HTTP ${res.statusCode})`);
     callback();
   }).on("error", () => {