更新

docker/nginx/default.conf

@@ -7,7 +7,9 @@ server {
 
     # Serve static files
     location / {
-        try_files $uri $uri/ =404;
+        # Try to serve the exact file, then directory, otherwise fall back to index.html
+        # This ensures accessing / or any SPA route returns /index.html
+        try_files $uri $uri/ /index.html;
     }
 
     # Proxy API requests to backend container