fix: vite server hotfix

frontend/nginx.prod.conf

@@ -0,0 +1,17 @@
+server {
+    listen 80;
+
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # SPA fallback — all unknown routes serve index.html
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Cache static assets
+    location ~* \.(js|css|png|svg|ico|woff2?)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+}