feat: add complete Docker setup for testing

- Update docker-compose.yml with frontend service and healthchecks

- Add frontend Dockerfile with dev and production stages

- Add nginx.conf for production frontend serving

- Add docker-compose.prod.yml for production deployment

- Add .env.example with all configuration options

- Add init scripts (init.sh, init.ps1) for easy setup

frontend/nginx.conf

@@ -0,0 +1,35 @@
+server {
+    listen 80;
+    server_name localhost;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # Gzip compression
+    gzip on;
+    gzip_types text/plain text/css application/json application/javascript text/xml application/xml;
+
+    # SPA routing - serve index.html for all routes
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Cache static assets
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+
+    # Proxy API requests to backend (for production)
+    location /api/ {
+        proxy_pass http://backend:8000/api/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    # Health endpoint proxy
+    location /health {
+        proxy_pass http://backend:8000/health;
+    }
+}