fix: add nginx config for SPA routing in production

- Create nginx.conf with try_files directive for React Router
- Update Dockerfile.prod to copy nginx configuration
- Fixes 404 errors on direct navigation to /login, /register, etc.
- Add gzip compression and static asset caching

frontend/Dockerfile.prod

@@ -26,8 +26,8 @@ FROM nginx:alpine
 # Copy built assets from builder stage
 COPY --from=builder /app/dist /usr/share/nginx/html
 
-# Copy nginx configuration (if needed)
-# COPY nginx.conf /etc/nginx/conf.d/default.conf
+# Copy nginx configuration for SPA routing
+COPY nginx.conf /etc/nginx/conf.d/default.conf
 
 # Expose port
 EXPOSE 80

frontend/nginx.conf

@@ -0,0 +1,23 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # Enable gzip compression
+    gzip on;
+    gzip_vary on;
+    gzip_min_length 1024;
+    gzip_types text/plain text/css text/xml text/javascript application/javascript application/json application/xml+rss image/svg+xml;
+
+    # SPA fallback - serve index.html for all non-file routes
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Cache static assets
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+}