build(deploy): add nginx configuration for web application serving

Add nginx.conf to serve the Expo web build and update Dockerfile.web to copy the configuration into the nginx container. This enables proper static file serving with appropriate MIME types and default caching headers for the production web deployment.

Dockerfile.web

@@ -10,6 +10,7 @@ RUN npx expo export --platform web --output-dir dist-web
 
 FROM nginx:1.27-alpine
 
+COPY nginx.conf /etc/nginx/conf.d/default.conf
 COPY --from=builder /app/dist-web /usr/share/nginx/html
 
 EXPOSE 80

nginx.conf

@@ -0,0 +1,19 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+
+    gzip on;
+    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript image/svg+xml;
+    gzip_min_length 256;
+}