Update service ports to 12015 for backend and 12016 for frontend; adjust configurations and documentation accordingly

nginx/coolify.conf

@@ -3,12 +3,12 @@
 
 # Backend API proxy
 upstream backend {
-    server 127.0.0.1:12000;
+    server 127.0.0.1:12015;
 }
 
 # Frontend proxy
 upstream frontend {
-    server 127.0.0.1:12001;
+    server 127.0.0.1:12016;
 }
 
 server {