Fix

frontend/nginx.conf

@@ -9,7 +9,8 @@ server {
     # Forward API requests to backend
     location /api/ {
         # Preserve the full path after /api when forwarding
-        proxy_pass         http://api:8000$request_uri;
+                # Forward to backend preserving /api prefix
+        proxy_pass         http://api:8000/api/;
         proxy_set_header   Host $host;
         proxy_set_header   X-Real-IP $remote_addr;
         proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;