fix(api): resolve TypeError in chat/completions ensureInitialized

initTranslators() is a no-op stub (translators self-register via static
imports). Wrapping the call with Promise.resolve() ensures .then() works
even when the function returns undefined instead of a Promise.

src/app/api/v1/chat/completions/route.js

@@ -9,7 +9,7 @@ let initPromise = null;
  */
 function ensureInitialized() {
   if (!initPromise) {
-    initPromise = initTranslators().then(() => {
+    initPromise = Promise.resolve(initTranslators()).then(() => {
       console.log("[SSE] Translators initialized");
     });
   }