Add Docker deployment with Traefik integration

- docker-compose.yml for container orchestration
- Dockerfile with multi-stage build (node builder + nginx)
- nginx.conf for SPA serving

nginx.conf

@@ -0,0 +1,23 @@
+server {
+    listen 80;
+    server_name localhost;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # Serve static files
+    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";
+    }
+
+    # Don't cache index.html
+    location = /index.html {
+        expires -1;
+        add_header Cache-Control "no-store, no-cache, must-revalidate";
+    }
+}