FIX(docker): copy public folder

- Add COPY command for public folder in Dockerfile
- Fixes 404 errors for static assets in production
- Next.js standalone mode requires manual public folder copy

deploy/docker/Dockerfile.prod

@@ -41,6 +41,7 @@ RUN chown nextjs:nodejs .next
 # https://nextjs.org/docs/advanced-features/output-file-tracing
 COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
 COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+COPY --from=builder --chown=nextjs:nodejs /app/public ./public
 
 USER nextjs