chore: add dockerfile, nginx.conf and infra/docker-compose.yml

dockerfile

@@ -0,0 +1,16 @@
+FROM node:25-alpine3.23 AS builder
+
+WORKDIR /app
+
+COPY package.json yarn.lock ./
+
+RUN yarn install --frozen-lockfile
+COPY . .
+RUN yarn build
+FROM nginx:alpine
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]