chore: add node docker service for vite dev server and prod build

docker/app/Dockerfile

@@ -30,6 +30,21 @@ ENV APP_ENV=dev \
     POSTGRES_USER=app \
     POSTGRES_PASSWORD=pwd
 
+###
+# Node build stage (for prod assets)
+###
+FROM node:22-alpine AS node-build
+
+WORKDIR /app
+
+COPY package.json package-lock.json* ./
+RUN npm install
+
+COPY assets/ ./assets/
+COPY vite.config.js ./
+
+RUN npm run build
+
 ###
 # Prod stage
 ###
@@ -40,6 +55,9 @@ RUN composer install --no-dev --no-scripts --no-autoloader --prefer-dist
 
 COPY . .
 
+# Copy Vite-built assets
+COPY --from=node-build /app/public/build /app/public/build
+
 RUN APP_ENV=prod composer dump-autoload --classmap-authoritative \
     && APP_ENV=prod composer run-script post-install-cmd \
     && chown -R www-data:www-data var/