doch wieder singleqoutes

nginx/conf.d/default.conf.template

@@ -8,7 +8,7 @@ server {
     # ———————————————— Audio + CORS + Key-Check ————————————————
     location ~* \.(opus|flac|ogg|mp3|wav|m4a|aac)$ {
 
-        if ($request_method = OPTIONS) {
+        if ($request_method = 'OPTIONS') {
             add_header Access-Control-Allow-Origin  "*" always;
             add_header Access-Control-Allow-Methods "GET, HEAD, OPTIONS" always;
             add_header Access-Control-Allow-Headers "X-API-Key, Content-Type, Keep-Alive, User-Agent, Cache-Control" always;