fix: Add nginx SPA routing config

frontend/Dockerfile

@@ -25,8 +25,8 @@ FROM nginx:alpine
 # Copy built app
 COPY --from=build /app/dist /usr/share/nginx/html
 
-# Copy nginx config (if exists)
-# COPY nginx.conf /etc/nginx/nginx.conf
+# Copy nginx config for SPA routing
+COPY nginx.conf /etc/nginx/conf.d/default.conf
 
 # Expose port
 EXPOSE 80

frontend/nginx.conf

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