chore: upgrade Node.js version to 22-alpine and adjust artifact copy path in Dockerfile

docker/Dockerfile

@@ -1,5 +1,5 @@
 # Stage 1 - build environment
-FROM node:18-alpine AS build
+FROM node:22-alpine AS build
 
 RUN apk add --no-cache python3 make g++ git
 
@@ -26,7 +26,7 @@ RUN npm run build:web
 FROM nginx:stable-alpine
 
 # Copy artifacts and nignx.conf
-COPY --from=build /usr/src/app/dist/ /usr/share/nginx/html
+COPY --from=build /usr/src/app/dist/browser /usr/share/nginx/html
 COPY --from=build /usr/src/app/docker/nginx.conf /etc/nginx/conf.d/default.conf
 
 CMD sed -i "s#http://localhost:3333#$BACKEND_URL#g" /usr/share/nginx/html/main.js && nginx -g 'daemon off;'